91331929 has 4 divisors (see below), whose sum is σ = 98357476. Its totient is φ = 84306384.

The previous prime is 91331927. The next prime is 91331953. The reversal of 91331929 is 92913319.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56250000 + 35081929 = 7500^2 + 5923^2 .

It is a cyclic number.

It is not a de Polignac number, because 91331929 - 2¹ = 91331927 is a prime.

It is a super-2 number, since 2×91331929² = 16683042509722082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91331927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3512754 + ... + 3512779.

It is an arithmetic number, because the mean of its divisors is an integer number (24589369).

Almost surely, 2^91331929 is an apocalyptic number.

It is an amenable number.

91331929 is a deficient number, since it is larger than the sum of its proper divisors (7025547).

91331929 is a wasteful number, since it uses less digits than its factorization.

91331929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7025546.

The product of its digits is 13122, while the sum is 37.

The square root of 91331929 is about 9556.7739849805. The cubic root of 91331929 is about 450.3403663606.

The spelling of 91331929 in words is "ninety-one million, three hundred thirty-one thousand, nine hundred twenty-nine".