36991271 has 4 divisors (see below), whose sum is σ = 38938200. Its totient is φ = 35044344.

The previous prime is 36991261. The next prime is 36991301. The reversal of 36991271 is 17219963.

It is a happy number.

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 36991271 - 2¹⁸ = 36729127 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 (36991261) 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, 973436 + ... + 973473.

It is an arithmetic number, because the mean of its divisors is an integer number (9734550).

Almost surely, 2^36991271 is an apocalyptic number.

36991271 is a deficient number, since it is larger than the sum of its proper divisors (1946929).

36991271 is a wasteful number, since it uses less digits than its factorization.

36991271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946928.

The product of its digits is 20412, while the sum is 38.

The square root of 36991271 is about 6082.0449685940. The cubic root of 36991271 is about 333.1959786311.

The spelling of 36991271 in words is "thirty-six million, nine hundred ninety-one thousand, two hundred seventy-one".