91520949 has 16 divisors (see below), whose sum is σ = 132293504. Its totient is φ = 55944000.

The previous prime is 91520941. The next prime is 91520953. The reversal of 91520949 is 94902519.

It is not a de Polignac number, because 91520949 - 2³ = 91520941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91520941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1882 + ... + 13659.

It is an arithmetic number, because the mean of its divisors is an integer number (8268344).

Almost surely, 2^91520949 is an apocalyptic number.

It is an amenable number.

91520949 is a deficient number, since it is larger than the sum of its proper divisors (40772555).

91520949 is a wasteful number, since it uses less digits than its factorization.

91520949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15708.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 91520949 is about 9566.6581939568. The cubic root of 91520949 is about 450.6508261703.

The spelling of 91520949 in words is "ninety-one million, five hundred twenty thousand, nine hundred forty-nine".