91137455 has 4 divisors (see below), whose sum is σ = 109364952. Its totient is φ = 72909960.

The previous prime is 91137439. The next prime is 91137461. The reversal of 91137455 is 55473119.

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

It is not a de Polignac number, because 91137455 - 2⁴ = 91137439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9113741 + ... + 9113750.

It is an arithmetic number, because the mean of its divisors is an integer number (27341238).

Almost surely, 2^91137455 is an apocalyptic number.

91137455 is a deficient number, since it is larger than the sum of its proper divisors (18227497).

91137455 is a wasteful number, since it uses less digits than its factorization.

91137455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18227496.

The product of its digits is 18900, while the sum is 35.

The square root of 91137455 is about 9546.5938952068. The cubic root of 91137455 is about 450.0205011236.

The spelling of 91137455 in words is "ninety-one million, one hundred thirty-seven thousand, four hundred fifty-five".