90991712302 has 4 divisors (see below), whose sum is σ = 136487568456. Its totient is φ = 45495856150.

The previous prime is 90991712299. The next prime is 90991712327. The reversal of 90991712302 is 20321719909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20321719909 = 4027 ⋅5046367.

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, 22747928074 + ... + 22747928077.

It is an arithmetic number, because the mean of its divisors is an integer number (34121892114).

Almost surely, 2^90991712302 is an apocalyptic number.

90991712302 is a deficient number, since it is larger than the sum of its proper divisors (45495856154).

90991712302 is a wasteful number, since it uses less digits than its factorization.

90991712302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45495856153.

The product of its (nonzero) digits is 61236, while the sum is 43.

The spelling of 90991712302 in words is "ninety billion, nine hundred ninety-one million, seven hundred twelve thousand, three hundred two".