31404047 has 2 divisors, whose sum is σ = 31404048. Its totient is φ = 31404046.

The previous prime is 31404011. The next prime is 31404059. The reversal of 31404047 is 74040413.

It is a strong prime.

It is an emirp because it is prime and its reverse (74040413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31404047 - 2¹⁶ = 31338511 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 (31404007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702023 + 15702024.

It is an arithmetic number, because the mean of its divisors is an integer number (15702024).

Almost surely, 2^31404047 is an apocalyptic number.

31404047 is a deficient number, since it is larger than the sum of its proper divisors (1).

31404047 is an equidigital number, since it uses as much as digits as its factorization.

31404047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 31404047 is about 5603.9313878741. The cubic root of 31404047 is about 315.4969798360.

The spelling of 31404047 in words is "thirty-one million, four hundred four thousand, forty-seven".