31503145309913 has 2 divisors, whose sum is σ = 31503145309914. Its totient is φ = 31503145309912.

The previous prime is 31503145309907. The next prime is 31503145309919. The reversal of 31503145309913 is 31990354130513.

It is a balanced prime because it is at equal distance from previous prime (31503145309907) and next prime (31503145309919).

It can be written as a sum of positive squares in only one way, i.e., 29788595999449 + 1714549310464 = 5457893^2 + 1309408^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31503145309913 is a prime.

It is not a weakly prime, because it can be changed into another prime (31503145309919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15751572654956 + 15751572654957.

It is an arithmetic number, because the mean of its divisors is an integer number (15751572654957).

Almost surely, 2^{31503145309913} is an apocalyptic number.

It is an amenable number.

31503145309913 is a deficient number, since it is larger than the sum of its proper divisors (1).

31503145309913 is an equidigital number, since it uses as much as digits as its factorization.

31503145309913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 656100, while the sum is 47.

The spelling of 31503145309913 in words is "thirty-one trillion, five hundred three billion, one hundred forty-five million, three hundred nine thousand, nine hundred thirteen".