91872761 has 4 divisors (see below), whose sum is σ = 92137872. Its totient is φ = 91607652.

The previous prime is 91872757. The next prime is 91872773. The reversal of 91872761 is 16727819.

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 not a de Polignac number, because 91872761 - 2² = 91872757 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91872791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132035 + ... + 132728.

It is an arithmetic number, because the mean of its divisors is an integer number (23034468).

Almost surely, 2^91872761 is an apocalyptic number.

It is an amenable number.

91872761 is a deficient number, since it is larger than the sum of its proper divisors (265111).

91872761 is a wasteful number, since it uses less digits than its factorization.

91872761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265110.

The product of its digits is 42336, while the sum is 41.

The square root of 91872761 is about 9585.0279603139. The cubic root of 91872761 is about 451.2275307448.

The spelling of 91872761 in words is "ninety-one million, eight hundred seventy-two thousand, seven hundred sixty-one".