90493859531 has 2 divisors, whose sum is σ = 90493859532. Its totient is φ = 90493859530.

The previous prime is 90493859441. The next prime is 90493859557. The reversal of 90493859531 is 13595839409.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90493859531 is a prime.

It is a super-2 number, since 2×90493859531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90493859431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45246929765 + 45246929766.

It is an arithmetic number, because the mean of its divisors is an integer number (45246929766).

Almost surely, 2^90493859531 is an apocalyptic number.

90493859531 is a deficient number, since it is larger than the sum of its proper divisors (1).

90493859531 is an equidigital number, since it uses as much as digits as its factorization.

90493859531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5248800, while the sum is 56.

It can be divided in two parts, 904938 and 59531, that added together give a palindrome (964469).

The spelling of 90493859531 in words is "ninety billion, four hundred ninety-three million, eight hundred fifty-nine thousand, five hundred thirty-one".