90444551 has 2 divisors, whose sum is σ = 90444552. Its totient is φ = 90444550.

The previous prime is 90444547. The next prime is 90444589. The reversal of 90444551 is 15544409.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90444551 - 2² = 90444547 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90444511) 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, 45222275 + 45222276.

It is an arithmetic number, because the mean of its divisors is an integer number (45222276).

Almost surely, 2^90444551 is an apocalyptic number.

90444551 is a deficient number, since it is larger than the sum of its proper divisors (1).

90444551 is an equidigital number, since it uses as much as digits as its factorization.

90444551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 90444551 is about 9510.2340139452. The cubic root of 90444551 is about 448.8771197609.

The spelling of 90444551 in words is "ninety million, four hundred forty-four thousand, five hundred fifty-one".