91521376 has 12 divisors (see below), whose sum is σ = 180182772. Its totient is φ = 45760672.

The previous prime is 91521373. The next prime is 91521379. The reversal of 91521376 is 67312519.

It is an interprime number because it is at equal distance from previous prime (91521373) and next prime (91521379).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91521373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1429990 + ... + 1430053.

It is an arithmetic number, because the mean of its divisors is an integer number (15015231).

Almost surely, 2^91521376 is an apocalyptic number.

91521376 is the 6051-st centered pentagonal number.

It is an amenable number.

91521376 is a deficient number, since it is larger than the sum of its proper divisors (88661396).

91521376 is a wasteful number, since it uses less digits than its factorization.

91521376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860053 (or 2860045 counting only the distinct ones).

The product of its digits is 11340, while the sum is 34.

The square root of 91521376 is about 9566.6805110237. The cubic root of 91521376 is about 450.6515270212.

The spelling of 91521376 in words is "ninety-one million, five hundred twenty-one thousand, three hundred seventy-six".