91913578202 has 4 divisors (see below), whose sum is σ = 137870367306. Its totient is φ = 45956789100.

The previous prime is 91913578201. The next prime is 91913578271. The reversal of 91913578202 is 20287531919.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20287531919 = 541 ⋅37500059.

It can be written as a sum of positive squares in only one way, i.e., 90758190121 + 1155388081 = 301261^2 + 33991^2 .

It is not an unprimeable number, because it can be changed into a prime (91913578201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22978394549 + ... + 22978394552.

Almost surely, 2^91913578202 is an apocalyptic number.

91913578202 is a deficient number, since it is larger than the sum of its proper divisors (45956789104).

91913578202 is a wasteful number, since it uses less digits than its factorization.

91913578202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45956789103.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 91913578202 in words is "ninety-one billion, nine hundred thirteen million, five hundred seventy-eight thousand, two hundred two".