91201012202 has 4 divisors (see below), whose sum is σ = 136801518306. Its totient is φ = 45600506100.

The previous prime is 91201012193. The next prime is 91201012211. The reversal of 91201012202 is 20221010219.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (91201012193) and next prime (91201012211).

It can be written as a sum of positive squares in only one way, i.e., 82117206721 + 9083805481 = 286561^2 + 95309^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22800253049 + ... + 22800253052.

Almost surely, 2^91201012202 is an apocalyptic number.

91201012202 is a deficient number, since it is larger than the sum of its proper divisors (45600506104).

91201012202 is a wasteful number, since it uses less digits than its factorization.

91201012202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45600506103.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 91201012202 in words is "ninety-one billion, two hundred one million, twelve thousand, two hundred two".