91542637 has 4 divisors (see below), whose sum is σ = 96927516. Its totient is φ = 86157760.

The previous prime is 91542631. The next prime is 91542667. The reversal of 91542637 is 73624519.

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 25948836 + 65593801 = 5094^2 + 8099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91542637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91542596 and 91542605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91542631) 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, 2692414 + ... + 2692447.

It is an arithmetic number, because the mean of its divisors is an integer number (24231879).

Almost surely, 2^91542637 is an apocalyptic number.

It is an amenable number.

91542637 is a deficient number, since it is larger than the sum of its proper divisors (5384879).

91542637 is a wasteful number, since it uses less digits than its factorization.

91542637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5384878.

The product of its digits is 45360, while the sum is 37.

The square root of 91542637 is about 9567.7916469789. The cubic root of 91542637 is about 450.6864207283.

It can be divided in two parts, 9 and 1542637, that added together give a triangular number (1542646 = T₁₇₅₆).

The spelling of 91542637 in words is "ninety-one million, five hundred forty-two thousand, six hundred thirty-seven".