91445761 has 4 divisors (see below), whose sum is σ = 99759024. Its totient is φ = 83132500.

The previous prime is 91445707. The next prime is 91445773. The reversal of 91445761 is 16754419.

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 de Polignac number, because none of the positive numbers 2^k-91445761 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 91445761.

It is not an unprimeable number, because it can be changed into a prime (91445791) 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, 4156615 + ... + 4156636.

It is an arithmetic number, because the mean of its divisors is an integer number (24939756).

Almost surely, 2^91445761 is an apocalyptic number.

It is an amenable number.

91445761 is a deficient number, since it is larger than the sum of its proper divisors (8313263).

91445761 is a wasteful number, since it uses less digits than its factorization.

91445761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8313262.

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

The square root of 91445761 is about 9562.7276966355. The cubic root of 91445761 is about 450.5273833309.

The spelling of 91445761 in words is "ninety-one million, four hundred forty-five thousand, seven hundred sixty-one".