31125047 has 2 divisors, whose sum is σ = 31125048. Its totient is φ = 31125046.

The previous prime is 31125007. The next prime is 31125071. The reversal of 31125047 is 74052113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31125047 - 2¹⁴ = 31108663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31125007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15562523 + 15562524.

It is an arithmetic number, because the mean of its divisors is an integer number (15562524).

Almost surely, 2^31125047 is an apocalyptic number.

31125047 is a deficient number, since it is larger than the sum of its proper divisors (1).

31125047 is an equidigital number, since it uses as much as digits as its factorization.

31125047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 31125047 is about 5578.9826133445. The cubic root of 31125047 is about 314.5598859103.

The spelling of 31125047 in words is "thirty-one million, one hundred twenty-five thousand, forty-seven".