91392649 has 4 divisors (see below), whose sum is σ = 93621780. Its totient is φ = 89163520.

The previous prime is 91392643. The next prime is 91392661. The reversal of 91392649 is 94629319.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52417600 + 38975049 = 7240^2 + 6243^2 .

It is not a de Polignac number, because 91392649 - 2¹¹ = 91390601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91392643) 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, 1114504 + ... + 1114585.

It is an arithmetic number, because the mean of its divisors is an integer number (23405445).

Almost surely, 2^91392649 is an apocalyptic number.

It is an amenable number.

91392649 is a deficient number, since it is larger than the sum of its proper divisors (2229131).

91392649 is a wasteful number, since it uses less digits than its factorization.

91392649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229130.

The product of its digits is 104976, while the sum is 43.

The square root of 91392649 is about 9559.9502613769. The cubic root of 91392649 is about 450.4401438417.

The spelling of 91392649 in words is "ninety-one million, three hundred ninety-two thousand, six hundred forty-nine".