31144644073 has 2 divisors, whose sum is σ = 31144644074. Its totient is φ = 31144644072.

The previous prime is 31144644049. The next prime is 31144644133. The reversal of 31144644073 is 37044644113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20896726249 + 10247917824 = 144557^2 + 101232^2 .

It is a cyclic number.

It is not a de Polignac number, because 31144644073 - 2²¹ = 31142546921 is a prime.

It is not a weakly prime, because it can be changed into another prime (31144644023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15572322036 + 15572322037.

It is an arithmetic number, because the mean of its divisors is an integer number (15572322037).

Almost surely, 2^31144644073 is an apocalyptic number.

It is an amenable number.

31144644073 is a deficient number, since it is larger than the sum of its proper divisors (1).

31144644073 is an equidigital number, since it uses as much as digits as its factorization.

31144644073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 37.

The spelling of 31144644073 in words is "thirty-one billion, one hundred forty-four million, six hundred forty-four thousand, seventy-three".