91731330 has 24 divisors (see below), whose sum is σ = 238501692. Its totient is φ = 24461664.

The previous prime is 91731319. The next prime is 91731349. The reversal of 91731330 is 3313719.

It can be written as a sum of positive squares in 2 ways, for example, as 84327489 + 7403841 = 9183^2 + 2721^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91731294 and 91731303.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 509529 + ... + 509708.

Almost surely, 2^91731330 is an apocalyptic number.

91731330 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

91731330 is an abundant number, since it is smaller than the sum of its proper divisors (146770362).

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

91731330 is a wasteful number, since it uses less digits than its factorization.

91731330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019250 (or 1019247 counting only the distinct ones).

The product of its (nonzero) digits is 1701, while the sum is 27.

The square root of 91731330 is about 9577.6474146838. The cubic root of 91731330 is about 450.9958685501.

The spelling of 91731330 in words is "ninety-one million, seven hundred thirty-one thousand, three hundred thirty".