31147147 has 2 divisors, whose sum is σ = 31147148. Its totient is φ = 31147146.

The previous prime is 31147139. The next prime is 31147153. The reversal of 31147147 is 74174113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31147147 - 2³ = 31147139 is a prime.

It is equal to p_1924480 and since 31147147 and 1924480 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31147177) 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, 15573573 + 15573574.

It is an arithmetic number, because the mean of its divisors is an integer number (15573574).

Almost surely, 2^31147147 is an apocalyptic number.

31147147 is a deficient number, since it is larger than the sum of its proper divisors (1).

31147147 is an equidigital number, since it uses as much as digits as its factorization.

31147147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 28.

The square root of 31147147 is about 5580.9629097495. The cubic root of 31147147 is about 314.6343182347.

The spelling of 31147147 in words is "thirty-one million, one hundred forty-seven thousand, one hundred forty-seven".