31442291 has 4 divisors (see below), whose sum is σ = 31462800. Its totient is φ = 31421784.

The previous prime is 31442273. The next prime is 31442347. The reversal of 31442291 is 19224413.

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 31442291 - 2¹⁴ = 31425907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31442291.

It is not an unprimeable number, because it can be changed into a prime (31442261) 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, 7751 + ... + 11088.

It is an arithmetic number, because the mean of its divisors is an integer number (7865700).

Almost surely, 2^31442291 is an apocalyptic number.

31442291 is a deficient number, since it is larger than the sum of its proper divisors (20509).

31442291 is a wasteful number, since it uses less digits than its factorization.

31442291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20508.

The product of its digits is 1728, while the sum is 26.

The square root of 31442291 is about 5607.3425969883. The cubic root of 31442291 is about 315.6249991308.

The spelling of 31442291 in words is "thirty-one million, four hundred forty-two thousand, two hundred ninety-one".