36931921 has 4 divisors (see below), whose sum is σ = 39772852. Its totient is φ = 34090992.

The previous prime is 36931907. The next prime is 36931931. The reversal of 36931921 is 12913963.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12913963 = 271 ⋅47653.

It can be written as a sum of positive squares in 2 ways, for example, as 2873025 + 34058896 = 1695^2 + 5836^2 .

It is not a de Polignac number, because 36931921 - 2⁹ = 36931409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36931931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1420446 + ... + 1420471.

It is an arithmetic number, because the mean of its divisors is an integer number (9943213).

Almost surely, 2^36931921 is an apocalyptic number.

It is an amenable number.

36931921 is a deficient number, since it is larger than the sum of its proper divisors (2840931).

36931921 is a wasteful number, since it uses less digits than its factorization.

36931921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840930.

The product of its digits is 8748, while the sum is 34.

The square root of 36931921 is about 6077.1638944494. The cubic root of 36931921 is about 333.0176864176.

The spelling of 36931921 in words is "thirty-six million, nine hundred thirty-one thousand, nine hundred twenty-one".