31540147 has 2 divisors, whose sum is σ = 31540148. Its totient is φ = 31540146.

The previous prime is 31540123. The next prime is 31540163. The reversal of 31540147 is 74104513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31540147 - 2²³ = 23151539 is a prime.

It is not a weakly prime, because it can be changed into another prime (31547147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770073 + 15770074.

It is an arithmetic number, because the mean of its divisors is an integer number (15770074).

Almost surely, 2^31540147 is an apocalyptic number.

31540147 is a deficient number, since it is larger than the sum of its proper divisors (1).

31540147 is an equidigital number, since it uses as much as digits as its factorization.

31540147 is an odious number, because the sum of its binary digits is odd.

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

The square root of 31540147 is about 5616.0615203183. The cubic root of 31540147 is about 315.9520937632.

The spelling of 31540147 in words is "thirty-one million, five hundred forty thousand, one hundred forty-seven".