31740047 has 2 divisors, whose sum is σ = 31740048. Its totient is φ = 31740046.

The previous prime is 31740031. The next prime is 31740061. The reversal of 31740047 is 74004713.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31740047 - 2⁴ = 31740031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31739998 and 31740025.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31740017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15870023 + 15870024.

It is an arithmetic number, because the mean of its divisors is an integer number (15870024).

Almost surely, 2^31740047 is an apocalyptic number.

31740047 is a deficient number, since it is larger than the sum of its proper divisors (1).

31740047 is an equidigital number, since it uses as much as digits as its factorization.

31740047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 31740047 is about 5633.8305796323. The cubic root of 31740047 is about 316.6181851294.

The spelling of 31740047 in words is "thirty-one million, seven hundred forty thousand, forty-seven".