31442431 has 2 divisors, whose sum is σ = 31442432. Its totient is φ = 31442430.

The previous prime is 31442419. The next prime is 31442441. The reversal of 31442431 is 13424413.

It is a strong prime.

It is an emirp because it is prime and its reverse (13424413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31442431 - 2¹⁵ = 31409663 is a prime.

It is a super-2 number, since 2×31442431² = 1977252934379522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31442441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15721215 + 15721216.

It is an arithmetic number, because the mean of its divisors is an integer number (15721216).

Almost surely, 2^31442431 is an apocalyptic number.

31442431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31442431 is an equidigital number, since it uses as much as digits as its factorization.

31442431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 22.

The square root of 31442431 is about 5607.3550806062. The cubic root of 31442431 is about 315.6254675809.

Adding to 31442431 its reverse (13424413), we get a palindrome (44866844).

The spelling of 31442431 in words is "thirty-one million, four hundred forty-two thousand, four hundred thirty-one".