31004387 has 2 divisors, whose sum is σ = 31004388. Its totient is φ = 31004386.

The previous prime is 31004353. The next prime is 31004423. The reversal of 31004387 is 78340013.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31004387 - 2¹⁰ = 31003363 is a prime.

It is a super-2 number, since 2×31004387² = 1922544026491538, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31007387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15502193 + 15502194.

It is an arithmetic number, because the mean of its divisors is an integer number (15502194).

Almost surely, 2^31004387 is an apocalyptic number.

31004387 is a deficient number, since it is larger than the sum of its proper divisors (1).

31004387 is an equidigital number, since it uses as much as digits as its factorization.

31004387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 31004387 is about 5568.1583131229. The cubic root of 31004387 is about 314.1528830745.

The spelling of 31004387 in words is "thirty-one million, four thousand, three hundred eighty-seven".