91144657 has 4 divisors (see below), whose sum is σ = 91748416. Its totient is φ = 90540900.

The previous prime is 91144643. The next prime is 91144687. The reversal of 91144657 is 75644119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91144657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91144687) 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, 301653 + ... + 301954.

It is an arithmetic number, because the mean of its divisors is an integer number (22937104).

Almost surely, 2^91144657 is an apocalyptic number.

It is an amenable number.

91144657 is a deficient number, since it is larger than the sum of its proper divisors (603759).

91144657 is a wasteful number, since it uses less digits than its factorization.

91144657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603758.

The product of its digits is 30240, while the sum is 37.

The square root of 91144657 is about 9546.9710903511. The cubic root of 91144657 is about 450.0323548753.

The spelling of 91144657 in words is "ninety-one million, one hundred forty-four thousand, six hundred fifty-seven".