31291241 has 4 divisors (see below), whose sum is σ = 32054484. Its totient is φ = 30528000.

The previous prime is 31291219. The next prime is 31291279. The reversal of 31291241 is 14219213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6739216 + 24552025 = 2596^2 + 4955^2 .

It is a cyclic number.

It is not a de Polignac number, because 31291241 - 2⁶ = 31291177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31201241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381560 + ... + 381641.

It is an arithmetic number, because the mean of its divisors is an integer number (8013621).

Almost surely, 2^31291241 is an apocalyptic number.

It is an amenable number.

31291241 is a deficient number, since it is larger than the sum of its proper divisors (763243).

31291241 is an equidigital number, since it uses as much as digits as its factorization.

31291241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763242.

The product of its digits is 432, while the sum is 23.

The square root of 31291241 is about 5593.8574347225. The cubic root of 31291241 is about 315.1187626422.

The spelling of 31291241 in words is "thirty-one million, two hundred ninety-one thousand, two hundred forty-one".