90819251 has 2 divisors, whose sum is σ = 90819252. Its totient is φ = 90819250.

The previous prime is 90819229. The next prime is 90819277. The reversal of 90819251 is 15291809.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90819251 - 2⁶ = 90819187 is a prime.

It is not a weakly prime, because it can be changed into another prime (90813251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45409625 + 45409626.

It is an arithmetic number, because the mean of its divisors is an integer number (45409626).

Almost surely, 2^90819251 is an apocalyptic number.

90819251 is a deficient number, since it is larger than the sum of its proper divisors (1).

90819251 is an equidigital number, since it uses as much as digits as its factorization.

90819251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 90819251 is about 9529.9134833429. The cubic root of 90819251 is about 449.4961455215.

The spelling of 90819251 in words is "ninety million, eight hundred nineteen thousand, two hundred fifty-one".