91143920 has 60 divisors (see below), whose sum is σ = 246517704. Its totient is φ = 31248000.

The previous prime is 91143889. The next prime is 91143971. The reversal of 91143920 is 2934119.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7706 + ... + 15545.

Almost surely, 2^91143920 is an apocalyptic number.

It is an amenable number.

91143920 is an abundant number, since it is smaller than the sum of its proper divisors (155373784).

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

91143920 is a wasteful number, since it uses less digits than its factorization.

91143920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23278 (or 23265 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 91143920 is about 9546.9324916436. The cubic root of 91143920 is about 450.0311418777.

The spelling of 91143920 in words is "ninety-one million, one hundred forty-three thousand, nine hundred twenty".