631281878441 has 2 divisors, whose sum is σ = 631281878442. Its totient is φ = 631281878440.

The previous prime is 631281878417. The next prime is 631281878449. The reversal of 631281878441 is 144878182136.

631281878441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 607472154025 + 23809724416 = 779405^2 + 154304^2 .

It is a cyclic number.

It is not a de Polignac number, because 631281878441 - 2⁶ = 631281878377 is a prime.

It is not a weakly prime, because it can be changed into another prime (631281878449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315640939220 + 315640939221.

It is an arithmetic number, because the mean of its divisors is an integer number (315640939221).

Almost surely, 2^631281878441 is an apocalyptic number.

It is an amenable number.

631281878441 is a deficient number, since it is larger than the sum of its proper divisors (1).

631281878441 is an equidigital number, since it uses as much as digits as its factorization.

631281878441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2064384, while the sum is 53.

The spelling of 631281878441 in words is "six hundred thirty-one billion, two hundred eighty-one million, eight hundred seventy-eight thousand, four hundred forty-one".