31461455416421 has 2 divisors, whose sum is σ = 31461455416422. Its totient is φ = 31461455416420.

The previous prime is 31461455416411. The next prime is 31461455416427. The reversal of 31461455416421 is 12461455416413.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28826579783521 + 2634875632900 = 5369039^2 + 1623230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31461455416421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31461455416427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15730727708210 + 15730727708211.

It is an arithmetic number, because the mean of its divisors is an integer number (15730727708211).

Almost surely, 2^{31461455416421} is an apocalyptic number.

It is an amenable number.

31461455416421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31461455416421 is an equidigital number, since it uses as much as digits as its factorization.

31461455416421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382400, while the sum is 47.

The spelling of 31461455416421 in words is "thirty-one trillion, four hundred sixty-one billion, four hundred fifty-five million, four hundred sixteen thousand, four hundred twenty-one".