36891561 has 12 divisors (see below), whose sum is σ = 57219792. Its totient is φ = 21080808.

The previous prime is 36891541. The next prime is 36891577. The reversal of 36891561 is 16519863.

It is not a de Polignac number, because 36891561 - 2⁷ = 36891433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (36891511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125335 + ... + 125628.

It is an arithmetic number, because the mean of its divisors is an integer number (4768316).

Almost surely, 2^36891561 is an apocalyptic number.

It is an amenable number.

36891561 is a deficient number, since it is larger than the sum of its proper divisors (20328231).

36891561 is a wasteful number, since it uses less digits than its factorization.

36891561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250980 (or 250973 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 36891561 is about 6073.8423588368. The cubic root of 36891561 is about 332.8963325636.

The spelling of 36891561 in words is "thirty-six million, eight hundred ninety-one thousand, five hundred sixty-one".