91212402 has 8 divisors (see below), whose sum is σ = 182424816. Its totient is φ = 30404132.

The previous prime is 91212397. The next prime is 91212403. The reversal of 91212402 is 20421219.

It is a sphenic number, since it is the product of 3 distinct primes.

91212402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (91212403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7601028 + ... + 7601039.

It is an arithmetic number, because the mean of its divisors is an integer number (22803102).

Almost surely, 2^91212402 is an apocalyptic number.

91212402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91212402 is a wasteful number, since it uses less digits than its factorization.

91212402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15202072.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 91212402 is about 9550.5184152485. The cubic root of 91212402 is about 450.1438256316.

The spelling of 91212402 in words is "ninety-one million, two hundred twelve thousand, four hundred two".