91149831772 has 12 divisors (see below), whose sum is σ = 166447519056. Its totient is φ = 43593397760.

The previous prime is 91149831767. The next prime is 91149831793. The reversal of 91149831772 is 27713894119.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495379429 + ... + 495379612.

It is an arithmetic number, because the mean of its divisors is an integer number (13870626588).

Almost surely, 2^91149831772 is an apocalyptic number.

91149831772 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

91149831772 is a deficient number, since it is larger than the sum of its proper divisors (75297687284).

91149831772 is a wasteful number, since it uses less digits than its factorization.

91149831772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990759068 (or 990759066 counting only the distinct ones).

The product of its digits is 762048, while the sum is 52.

The spelling of 91149831772 in words is "ninety-one billion, one hundred forty-nine million, eight hundred thirty-one thousand, seven hundred seventy-two".