31138153 has 2 divisors, whose sum is σ = 31138154. Its totient is φ = 31138152.

The previous prime is 31138117. The next prime is 31138181. The reversal of 31138153 is 35183113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29997529 + 1140624 = 5477^2 + 1068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31138153 is a prime.

It is not a weakly prime, because it can be changed into another prime (31138103) 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, 15569076 + 15569077.

It is an arithmetic number, because the mean of its divisors is an integer number (15569077).

Almost surely, 2^31138153 is an apocalyptic number.

It is an amenable number.

31138153 is a deficient number, since it is larger than the sum of its proper divisors (1).

31138153 is an equidigital number, since it uses as much as digits as its factorization.

31138153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 31138153 is about 5580.1570766422. The cubic root of 31138153 is about 314.6040308863.

The spelling of 31138153 in words is "thirty-one million, one hundred thirty-eight thousand, one hundred fifty-three".