90437551 has 2 divisors, whose sum is σ = 90437552. Its totient is φ = 90437550.

The previous prime is 90437539. The next prime is 90437561. The reversal of 90437551 is 15573409.

It is a strong prime.

It is an emirp because it is prime and its reverse (15573409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90437551 - 2¹¹ = 90435503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90437561) 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, 45218775 + 45218776.

It is an arithmetic number, because the mean of its divisors is an integer number (45218776).

Almost surely, 2^90437551 is an apocalyptic number.

90437551 is a deficient number, since it is larger than the sum of its proper divisors (1).

90437551 is an equidigital number, since it uses as much as digits as its factorization.

90437551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 90437551 is about 9509.8659822313. The cubic root of 90437551 is about 448.8655391078.

The spelling of 90437551 in words is "ninety million, four hundred thirty-seven thousand, five hundred fifty-one".