31940761 has 4 divisors (see below), whose sum is σ = 31952692. Its totient is φ = 31928832.

The previous prime is 31940749. The next prime is 31940801. The reversal of 31940761 is 16704913.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6990736 + 24950025 = 2644^2 + 4995^2 .

It is a cyclic number.

It is not a de Polignac number, because 31940761 - 2¹³ = 31932569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31941761) 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 3 ways as a sum of consecutive naturals, for example, 121 + ... + 7993.

It is an arithmetic number, because the mean of its divisors is an integer number (7988173).

Almost surely, 2^31940761 is an apocalyptic number.

It is an amenable number.

31940761 is a deficient number, since it is larger than the sum of its proper divisors (11931).

31940761 is an equidigital number, since it uses as much as digits as its factorization.

31940761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11930.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 31940761 is about 5651.6157866578. The cubic root of 31940761 is about 317.2841809400.

The spelling of 31940761 in words is "thirty-one million, nine hundred forty thousand, seven hundred sixty-one".