31125247 has 2 divisors, whose sum is σ = 31125248. Its totient is φ = 31125246.

The previous prime is 31125239. The next prime is 31125253. The reversal of 31125247 is 74252113.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31125247 - 2³ = 31125239 is a prime.

It is a super-2 number, since 2×31125247² = 1937562001622018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31125217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15562623 + 15562624.

It is an arithmetic number, because the mean of its divisors is an integer number (15562624).

Almost surely, 2^31125247 is an apocalyptic number.

31125247 is a deficient number, since it is larger than the sum of its proper divisors (1).

31125247 is an equidigital number, since it uses as much as digits as its factorization.

31125247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 25.

The square root of 31125247 is about 5579.0005377308. Note that the first 3 decimals coincide. The cubic root of 31125247 is about 314.5605596640.

The spelling of 31125247 in words is "thirty-one million, one hundred twenty-five thousand, two hundred forty-seven".