31401439 has 2 divisors, whose sum is σ = 31401440. Its totient is φ = 31401438.

The previous prime is 31401407. The next prime is 31401451. The reversal of 31401439 is 93410413.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31401439 - 2⁵ = 31401407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31401479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15700719 + 15700720.

It is an arithmetic number, because the mean of its divisors is an integer number (15700720).

Almost surely, 2^31401439 is an apocalyptic number.

31401439 is a deficient number, since it is larger than the sum of its proper divisors (1).

31401439 is an equidigital number, since it uses as much as digits as its factorization.

31401439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 31401439 is about 5603.6986892587. The cubic root of 31401439 is about 315.4882459415.

The spelling of 31401439 in words is "thirty-one million, four hundred one thousand, four hundred thirty-nine".