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688878241 is a prime number
BaseRepresentation
bin101001000011110…
…111001010100001
31210000020122021221
4221003313022201
52402323100431
6152205015041
723033240242
oct5103671241
91700218257
10688878241
11323943467
12172854481
13ac94707c
14676c0cc9
1540727111
hex290f72a1

688878241 has 2 divisors, whose sum is σ = 688878242. Its totient is φ = 688878240.

The previous prime is 688878227. The next prime is 688878251. The reversal of 688878241 is 142878886.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 684345600 + 4532641 = 26160^2 + 2129^2 .

It is a cyclic number.

It is not a de Polignac number, because 688878241 - 223 = 680489633 is a prime.

It is not a weakly prime, because it can be changed into another prime (688878251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344439120 + 344439121.

It is an arithmetic number, because the mean of its divisors is an integer number (344439121).

Almost surely, 2688878241 is an apocalyptic number.

It is an amenable number.

688878241 is a deficient number, since it is larger than the sum of its proper divisors (1).

688878241 is an equidigital number, since it uses as much as digits as its factorization.

688878241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1376256, while the sum is 52.

The square root of 688878241 is about 26246.4900701027. The cubic root of 688878241 is about 883.1764684388.

The spelling of 688878241 in words is "six hundred eighty-eight million, eight hundred seventy-eight thousand, two hundred forty-one".