91461985 has 4 divisors (see below), whose sum is σ = 109754388. Its totient is φ = 73169584.

The previous prime is 91461899. The next prime is 91462061. The reversal of 91461985 is 58916419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58916419 = 2447 ⋅24077.

It can be written as a sum of positive squares in 2 ways, for example, as 44182609 + 47279376 = 6647^2 + 6876^2 .

It is a cyclic number.

It is not a de Polignac number, because 91461985 - 2¹³ = 91453793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9146194 + ... + 9146203.

It is an arithmetic number, because the mean of its divisors is an integer number (27438597).

Almost surely, 2^91461985 is an apocalyptic number.

It is an amenable number.

91461985 is a deficient number, since it is larger than the sum of its proper divisors (18292403).

91461985 is a wasteful number, since it uses less digits than its factorization.

91461985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18292402.

The product of its digits is 77760, while the sum is 43.

The square root of 91461985 is about 9563.5759525399. The cubic root of 91461985 is about 450.5540254408.

The spelling of 91461985 in words is "ninety-one million, four hundred sixty-one thousand, nine hundred eighty-five".