91961685 has 48 divisors (see below), whose sum is σ = 163762560. Its totient is φ = 47725440.

The previous prime is 91961669. The next prime is 91961711. The reversal of 91961685 is 58616919.

It is not a de Polignac number, because 91961685 - 2⁴ = 91961669 is a prime.

It is a super-3 number, since 3×91961685³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91961685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 341731 + ... + 341999.

It is an arithmetic number, because the mean of its divisors is an integer number (3411720).

Almost surely, 2^91961685 is an apocalyptic number.

It is an amenable number.

91961685 is a deficient number, since it is larger than the sum of its proper divisors (71800875).

91961685 is a wasteful number, since it uses less digits than its factorization.

91961685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458 (or 455 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 91961685 is about 9589.6655311851. The cubic root of 91961685 is about 451.3730654233.

The spelling of 91961685 in words is "ninety-one million, nine hundred sixty-one thousand, six hundred eighty-five".