90972451 has 2 divisors, whose sum is σ = 90972452. Its totient is φ = 90972450.

The previous prime is 90972421. The next prime is 90972461. The reversal of 90972451 is 15427909.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90972451 - 2⁹ = 90971939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90972451.

It is not a weakly prime, because it can be changed into another prime (90972421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45486225 + 45486226.

It is an arithmetic number, because the mean of its divisors is an integer number (45486226).

Almost surely, 2^90972451 is an apocalyptic number.

90972451 is the 4266-th centered decagonal number.

90972451 is a deficient number, since it is larger than the sum of its proper divisors (1).

90972451 is an equidigital number, since it uses as much as digits as its factorization.

90972451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 90972451 is about 9537.9479449198. The cubic root of 90972451 is about 449.7487502802.

The spelling of 90972451 in words is "ninety million, nine hundred seventy-two thousand, four hundred fifty-one".