31448839 has 2 divisors, whose sum is σ = 31448840. Its totient is φ = 31448838.

The previous prime is 31448821. The next prime is 31448863. The reversal of 31448839 is 93884413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31448839 - 2²¹ = 29351687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31448899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15724419 + 15724420.

It is an arithmetic number, because the mean of its divisors is an integer number (15724420).

Almost surely, 2^31448839 is an apocalyptic number.

31448839 is a deficient number, since it is larger than the sum of its proper divisors (1).

31448839 is an equidigital number, since it uses as much as digits as its factorization.

31448839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 31448839 is about 5607.9264438828. The cubic root of 31448839 is about 315.6469077235.

The spelling of 31448839 in words is "thirty-one million, four hundred forty-eight thousand, eight hundred thirty-nine".