90981619 has 2 divisors, whose sum is σ = 90981620. Its totient is φ = 90981618.

The previous prime is 90981589. The next prime is 90981659. The reversal of 90981619 is 91618909.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90981619 - 2¹¹ = 90979571 is a prime.

It is a super-2 number, since 2×90981619² = 16555309991722322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90981659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45490809 + 45490810.

It is an arithmetic number, because the mean of its divisors is an integer number (45490810).

Almost surely, 2^90981619 is an apocalyptic number.

90981619 is a deficient number, since it is larger than the sum of its proper divisors (1).

90981619 is an equidigital number, since it uses as much as digits as its factorization.

90981619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 90981619 is about 9538.4285393350. The cubic root of 90981619 is about 449.7638579968.

It can be divided in two parts, 909 and 81619, that added together give a palindrome (82528).

The spelling of 90981619 in words is "ninety million, nine hundred eighty-one thousand, six hundred nineteen".