90881251 has 2 divisors, whose sum is σ = 90881252. Its totient is φ = 90881250.

The previous prime is 90881239. The next prime is 90881261. The reversal of 90881251 is 15218809.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90881251 - 2²¹ = 88784099 is a prime.

It is not a weakly prime, because it can be changed into another prime (90881261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45440625 + 45440626.

It is an arithmetic number, because the mean of its divisors is an integer number (45440626).

Almost surely, 2^90881251 is an apocalyptic number.

90881251 is a deficient number, since it is larger than the sum of its proper divisors (1).

90881251 is an equidigital number, since it uses as much as digits as its factorization.

90881251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 90881251 is about 9533.1658435170. The cubic root of 90881251 is about 449.5984087948.

The spelling of 90881251 in words is "ninety million, eight hundred eighty-one thousand, two hundred fifty-one".