31404002431 has 2 divisors, whose sum is σ = 31404002432. Its totient is φ = 31404002430.

The previous prime is 31404002423. The next prime is 31404002467. The reversal of 31404002431 is 13420040413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31404002431 - 2³ = 31404002423 is a prime.

It is a super-2 number, since 2×31404002431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31404002411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702001215 + 15702001216.

It is an arithmetic number, because the mean of its divisors is an integer number (15702001216).

Almost surely, 2^31404002431 is an apocalyptic number.

31404002431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31404002431 is an equidigital number, since it uses as much as digits as its factorization.

31404002431 is an evil number, because the sum of its binary digits is even.

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

Adding to 31404002431 its reverse (13420040413), we get a palindrome (44824042844).

The spelling of 31404002431 in words is "thirty-one billion, four hundred four million, two thousand, four hundred thirty-one".