90691457 has 2 divisors, whose sum is σ = 90691458. Its totient is φ = 90691456.

The previous prime is 90691453. The next prime is 90691499. The reversal of 90691457 is 75419609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80982001 + 9709456 = 8999^2 + 3116^2 .

It is a cyclic number.

It is not a de Polignac number, because 90691457 - 2² = 90691453 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90691453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45345728 + 45345729.

It is an arithmetic number, because the mean of its divisors is an integer number (45345729).

Almost surely, 2^90691457 is an apocalyptic number.

It is an amenable number.

90691457 is a deficient number, since it is larger than the sum of its proper divisors (1).

90691457 is an equidigital number, since it uses as much as digits as its factorization.

90691457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 90691457 is about 9523.2062352970. The cubic root of 90691457 is about 449.2852141974.

The spelling of 90691457 in words is "ninety million, six hundred ninety-one thousand, four hundred fifty-seven".