91143900 has 72 divisors (see below), whose sum is σ = 293019440. Its totient is φ = 24304320.

The previous prime is 91143889. The next prime is 91143971. The reversal of 91143900 is 934119.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14179 + ... + 19578.

Almost surely, 2^91143900 is an apocalyptic number.

91143900 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91143900 is an abundant number, since it is smaller than the sum of its proper divisors (201875540).

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

91143900 is a wasteful number, since it uses less digits than its factorization.

91143900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33780 (or 33767 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 91143900 is about 9546.9314441867. The cubic root of 91143900 is about 450.0311089605.

The spelling of 91143900 in words is "ninety-one million, one hundred forty-three thousand, nine hundred".