90698891 has 2 divisors, whose sum is σ = 90698892. Its totient is φ = 90698890.

The previous prime is 90698843. The next prime is 90698897. The reversal of 90698891 is 19889609.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90698891 - 2²⁶ = 23590027 is a prime.

It is not a weakly prime, because it can be changed into another prime (90698897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45349445 + 45349446.

It is an arithmetic number, because the mean of its divisors is an integer number (45349446).

Almost surely, 2^90698891 is an apocalyptic number.

90698891 is a deficient number, since it is larger than the sum of its proper divisors (1).

90698891 is an equidigital number, since it uses as much as digits as its factorization.

90698891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 90698891 is about 9523.5965370232. The cubic root of 90698891 is about 449.2974898667.

The spelling of 90698891 in words is "ninety million, six hundred ninety-eight thousand, eight hundred ninety-one".