91513151 has 4 divisors (see below), whose sum is σ = 91632312. Its totient is φ = 91393992.

The previous prime is 91513127. The next prime is 91513153. The reversal of 91513151 is 15131519.

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 91513151 - 2²⁶ = 24404287 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 91513151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91513153) 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, 58421 + ... + 59966.

It is an arithmetic number, because the mean of its divisors is an integer number (22908078).

Almost surely, 2^91513151 is an apocalyptic number.

91513151 is a deficient number, since it is larger than the sum of its proper divisors (119161).

91513151 is a wasteful number, since it uses less digits than its factorization.

91513151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119160.

The product of its digits is 675, while the sum is 26.

The square root of 91513151 is about 9566.2506239383. The cubic root of 91513151 is about 450.6380266419.

The spelling of 91513151 in words is "ninety-one million, five hundred thirteen thousand, one hundred fifty-one".