31309954573 has 2 divisors, whose sum is σ = 31309954574. Its totient is φ = 31309954572.

The previous prime is 31309954553. The next prime is 31309954583. The reversal of 31309954573 is 37545990313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27975238564 + 3334716009 = 167258^2 + 57747^2 .

It is a cyclic number.

It is not a de Polignac number, because 31309954573 - 2²¹ = 31307857421 is a prime.

It is a super-2 number, since 2×31309954573² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31309954553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15654977286 + 15654977287.

It is an arithmetic number, because the mean of its divisors is an integer number (15654977287).

Almost surely, 2^31309954573 is an apocalyptic number.

It is an amenable number.

31309954573 is a deficient number, since it is larger than the sum of its proper divisors (1).

31309954573 is an equidigital number, since it uses as much as digits as its factorization.

31309954573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1530900, while the sum is 49.

The spelling of 31309954573 in words is "thirty-one billion, three hundred nine million, nine hundred fifty-four thousand, five hundred seventy-three".