36156991 has 4 divisors (see below), whose sum is σ = 38938312. Its totient is φ = 33375672.

The previous prime is 36156983. The next prime is 36157001. The reversal of 36156991 is 19965163.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 36156991 - 2³ = 36156983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36156941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1390641 + ... + 1390666.

It is an arithmetic number, because the mean of its divisors is an integer number (9734578).

Almost surely, 2^36156991 is an apocalyptic number.

36156991 is a deficient number, since it is larger than the sum of its proper divisors (2781321).

36156991 is a wasteful number, since it uses less digits than its factorization.

36156991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2781320.

The product of its digits is 43740, while the sum is 40.

The square root of 36156991 is about 6013.0683515157. The cubic root of 36156991 is about 330.6720037447.

The spelling of 36156991 in words is "thirty-six million, one hundred fifty-six thousand, nine hundred ninety-one".