90697889 has 2 divisors, whose sum is σ = 90697890. Its totient is φ = 90697888.

The previous prime is 90697883. The next prime is 90697897. The reversal of 90697889 is 98879609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64000000 + 26697889 = 8000^2 + 5167^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90697889 is a prime.

It is a super-2 number, since 2×90697889² = 16452214138112642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90697883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45348944 + 45348945.

It is an arithmetic number, because the mean of its divisors is an integer number (45348945).

Almost surely, 2^90697889 is an apocalyptic number.

It is an amenable number.

90697889 is a deficient number, since it is larger than the sum of its proper divisors (1).

90697889 is an equidigital number, since it uses as much as digits as its factorization.

90697889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 90697889 is about 9523.5439307014. The cubic root of 90697889 is about 449.2958353160.

The spelling of 90697889 in words is "ninety million, six hundred ninety-seven thousand, eight hundred eighty-nine".