90699251 has 2 divisors, whose sum is σ = 90699252. Its totient is φ = 90699250.

The previous prime is 90699239. The next prime is 90699311. The reversal of 90699251 is 15299609.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90699251 - 2⁶ = 90699187 is a prime.

It is a super-2 number, since 2×90699251² = 16452708263922002, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90699199 and 90699208.

It is not a weakly prime, because it can be changed into another prime (90699551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45349625 + 45349626.

It is an arithmetic number, because the mean of its divisors is an integer number (45349626).

Almost surely, 2^90699251 is an apocalyptic number.

90699251 is a deficient number, since it is larger than the sum of its proper divisors (1).

90699251 is an equidigital number, since it uses as much as digits as its factorization.

90699251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 90699251 is about 9523.6154374271. The cubic root of 90699251 is about 449.2980843131.

The spelling of 90699251 in words is "ninety million, six hundred ninety-nine thousand, two hundred fifty-one".