31541245139 has 2 divisors, whose sum is σ = 31541245140. Its totient is φ = 31541245138.

The previous prime is 31541245111. The next prime is 31541245189. The reversal of 31541245139 is 93154214513.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (93154214513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31541245139 - 2¹⁶ = 31541179603 is a prime.

It is a super-2 number, since 2×31541245139² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31541245189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770622569 + 15770622570.

It is an arithmetic number, because the mean of its divisors is an integer number (15770622570).

Almost surely, 2^31541245139 is an apocalyptic number.

31541245139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31541245139 is an equidigital number, since it uses as much as digits as its factorization.

31541245139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 38.

The spelling of 31541245139 in words is "thirty-one billion, five hundred forty-one million, two hundred forty-five thousand, one hundred thirty-nine".