90978113 has 4 divisors (see below), whose sum is σ = 91159488. Its totient is φ = 90796740.

The previous prime is 90978109. The next prime is 90978119. The reversal of 90978113 is 31187909.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31187909 = 281 ⋅110989.

It is a cyclic number.

It is not a de Polignac number, because 90978113 - 2² = 90978109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90978119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89933 + ... + 90938.

It is an arithmetic number, because the mean of its divisors is an integer number (22789872).

Almost surely, 2^90978113 is an apocalyptic number.

It is an amenable number.

90978113 is a deficient number, since it is larger than the sum of its proper divisors (181375).

90978113 is a wasteful number, since it uses less digits than its factorization.

90978113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181374.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 90978113 is about 9538.2447546705. The cubic root of 90978113 is about 449.7580806674.

The spelling of 90978113 in words is "ninety million, nine hundred seventy-eight thousand, one hundred thirteen".