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123981077 = 1121935309
BaseRepresentation
bin1110110001111…
…00110100010101
322122021220001202
413120330310111
5223214343302
620145202245
73033551603
oct730746425
9278256052
10123981077
1163a90900
1235630385
131c8bbcac
1412674873
15ad40202
hex763cd15

123981077 has 12 divisors (see below), whose sum is σ = 137008620. Its totient is φ = 112104960.

The previous prime is 123981073. The next prime is 123981101. The reversal of 123981077 is 770189321.

It can be written as a sum of positive squares in 2 ways, for example, as 9897316 + 114083761 = 3146^2 + 10681^2 .

It is not a de Polignac number, because 123981077 - 22 = 123981073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123981077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123981073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20699 + ... + 26007.

It is an arithmetic number, because the mean of its divisors is an integer number (11417385).

Almost surely, 2123981077 is an apocalyptic number.

It is an amenable number.

123981077 is a deficient number, since it is larger than the sum of its proper divisors (13027543).

123981077 is a wasteful number, since it uses less digits than its factorization.

123981077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5524 (or 5513 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 123981077 is about 11134.6790254592. The cubic root of 123981077 is about 498.6377277997.

The spelling of 123981077 in words is "one hundred twenty-three million, nine hundred eighty-one thousand, seventy-seven".

Divisors: 1 11 121 193 2123 5309 23353 58399 642389 1024637 11271007 123981077