31555621012461 has 32 divisors (see below), whose sum is σ = 54829676337408. Its totient is φ = 15665621806080.

The previous prime is 31555621012453. The next prime is 31555621012481. The reversal of 31555621012461 is 16421012655513.

It is not a de Polignac number, because 31555621012461 - 2³ = 31555621012453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31555621012481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3399652870 + ... + 3399662151.

It is an arithmetic number, because the mean of its divisors is an integer number (1713427385544).

Almost surely, 2^{31555621012461} is an apocalyptic number.

It is an amenable number.

31555621012461 is a deficient number, since it is larger than the sum of its proper divisors (23274055324947).

31555621012461 is a wasteful number, since it uses less digits than its factorization.

31555621012461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6799315061.

The product of its (nonzero) digits is 216000, while the sum is 42.

Adding to 31555621012461 its reverse (16421012655513), we get a palindrome (47976633667974).

The spelling of 31555621012461 in words is "thirty-one trillion, five hundred fifty-five billion, six hundred twenty-one million, twelve thousand, four hundred sixty-one".