31203434461 has 2 divisors, whose sum is σ = 31203434462. Its totient is φ = 31203434460.

The previous prime is 31203434389. The next prime is 31203434473. The reversal of 31203434461 is 16443430213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30592108836 + 611325625 = 174906^2 + 24725^2 .

It is a cyclic number.

It is not a de Polignac number, because 31203434461 - 2¹¹ = 31203432413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31203404461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15601717230 + 15601717231.

It is an arithmetic number, because the mean of its divisors is an integer number (15601717231).

Almost surely, 2^31203434461 is an apocalyptic number.

It is an amenable number.

31203434461 is a deficient number, since it is larger than the sum of its proper divisors (1).

31203434461 is an equidigital number, since it uses as much as digits as its factorization.

31203434461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 31203434461 its reverse (16443430213), we get a palindrome (47646864674).

The spelling of 31203434461 in words is "thirty-one billion, two hundred three million, four hundred thirty-four thousand, four hundred sixty-one".