91873865 has 16 divisors (see below), whose sum is σ = 117365760. Its totient is φ = 68801280.

The previous prime is 91873853. The next prime is 91873867. The reversal of 91873865 is 56837819.

It is a happy number.

It is not a de Polignac number, because 91873865 - 2¹⁴ = 91857481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91873867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13406 + ... + 19064.

It is an arithmetic number, because the mean of its divisors is an integer number (7335360).

Almost surely, 2^91873865 is an apocalyptic number.

It is an amenable number.

91873865 is a deficient number, since it is larger than the sum of its proper divisors (25491895).

91873865 is a wasteful number, since it uses less digits than its factorization.

91873865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5872.

The product of its digits is 362880, while the sum is 47.

The square root of 91873865 is about 9585.0855499573. The cubic root of 91873865 is about 451.2293381474.

The spelling of 91873865 in words is "ninety-one million, eight hundred seventy-three thousand, eight hundred sixty-five".