91331351 has 4 divisors (see below), whose sum is σ = 92879400. Its totient is φ = 89783304.

The previous prime is 91331311. The next prime is 91331369. The reversal of 91331351 is 15313319.

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

It is a cyclic number.

It is not a de Polignac number, because 91331351 - 2⁶ = 91331287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91331351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91331311) 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, 773936 + ... + 774053.

It is an arithmetic number, because the mean of its divisors is an integer number (23219850).

Almost surely, 2^91331351 is an apocalyptic number.

91331351 is a deficient number, since it is larger than the sum of its proper divisors (1548049).

91331351 is a wasteful number, since it uses less digits than its factorization.

91331351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548048.

The product of its digits is 1215, while the sum is 26.

The square root of 91331351 is about 9556.7437446026. The cubic root of 91331351 is about 450.3394163559.

The spelling of 91331351 in words is "ninety-one million, three hundred thirty-one thousand, three hundred fifty-one".