90451523894 has 4 divisors (see below), whose sum is σ = 135677285844. Its totient is φ = 45225761946.

The previous prime is 90451523881. The next prime is 90451523917. The reversal of 90451523894 is 49832515409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49832515409 = 2473 ⋅20150633.

It is a congruent number.

It is an unprimeable number.

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, 22612880972 + ... + 22612880975.

It is an arithmetic number, because the mean of its divisors is an integer number (33919321461).

Almost surely, 2^90451523894 is an apocalyptic number.

90451523894 is a deficient number, since it is larger than the sum of its proper divisors (45225761950).

90451523894 is a wasteful number, since it uses less digits than its factorization.

90451523894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45225761949.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 90451523894 in words is "ninety billion, four hundred fifty-one million, five hundred twenty-three thousand, eight hundred ninety-four".