201310031509 has 2 divisors, whose sum is σ = 201310031510. Its totient is φ = 201310031508.

The previous prime is 201310031497. The next prime is 201310031519. The reversal of 201310031509 is 905130013102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179360720100 + 21949311409 = 423510^2 + 148153^2 .

It is a cyclic number.

It is not a de Polignac number, because 201310031509 - 2⁷ = 201310031381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201310031519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100655015754 + 100655015755.

It is an arithmetic number, because the mean of its divisors is an integer number (100655015755).

Almost surely, 2^201310031509 is an apocalyptic number.

It is an amenable number.

201310031509 is a deficient number, since it is larger than the sum of its proper divisors (1).

201310031509 is an equidigital number, since it uses as much as digits as its factorization.

201310031509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 25.

The spelling of 201310031509 in words is "two hundred one billion, three hundred ten million, thirty-one thousand, five hundred nine".