36131991 has 16 divisors (see below), whose sum is σ = 55186944. Its totient is φ = 20598624.

The previous prime is 36131989. The next prime is 36132037. The reversal of 36131991 is 19913163.

It is a happy number.

36131991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 36131991 - 2¹ = 36131989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36131951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8461 + ... + 11993.

It is an arithmetic number, because the mean of its divisors is an integer number (3449184).

Almost surely, 2^36131991 is an apocalyptic number.

36131991 is a deficient number, since it is larger than the sum of its proper divisors (19054953).

36131991 is a wasteful number, since it uses less digits than its factorization.

36131991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030.

The product of its digits is 4374, while the sum is 33.

The square root of 36131991 is about 6010.9891864817. The cubic root of 36131991 is about 330.5957740779.

The spelling of 36131991 in words is "thirty-six million, one hundred thirty-one thousand, nine hundred ninety-one".