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115157221 = 233494237
BaseRepresentation
bin1101101110100…
…10100011100101
322000200121000021
412313102203211
5213440012341
615232115141
72565551224
oct667224345
9260617007
10115157221
115a004363
1232695ab1
131ab1c88a
1411418cbb
15a19a9d1
hex6dd28e5

115157221 has 4 divisors (see below), whose sum is σ = 115651692. Its totient is φ = 114662752.

The previous prime is 115157213. The next prime is 115157239. The reversal of 115157221 is 122751511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32092225 + 83064996 = 5665^2 + 9114^2 .

It is a cyclic number.

It is not a de Polignac number, because 115157221 - 23 = 115157213 is a prime.

It is a super-2 number, since 2×1151572212 = 26522371096885682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115157261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246886 + ... + 247351.

It is an arithmetic number, because the mean of its divisors is an integer number (28912923).

Almost surely, 2115157221 is an apocalyptic number.

It is an amenable number.

115157221 is a deficient number, since it is larger than the sum of its proper divisors (494471).

115157221 is an equidigital number, since it uses as much as digits as its factorization.

115157221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494470.

The product of its digits is 700, while the sum is 25.

The square root of 115157221 is about 10731.1332579556. The cubic root of 115157221 is about 486.5159229022.

The spelling of 115157221 in words is "one hundred fifteen million, one hundred fifty-seven thousand, two hundred twenty-one".

Divisors: 1 233 494237 115157221