631020592381 has 4 divisors (see below), whose sum is σ = 631024603552. Its totient is φ = 631016581212.

The previous prime is 631020592379. The next prime is 631020592393. The reversal of 631020592381 is 183295020136.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631020592381 - 2¹ = 631020592379 is a prime.

It is a super-2 number, since 2×631020592381² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631020592981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1759551 + ... + 2087596.

It is an arithmetic number, because the mean of its divisors is an integer number (157756150888).

Almost surely, 2^631020592381 is an apocalyptic number.

It is an amenable number.

631020592381 is a deficient number, since it is larger than the sum of its proper divisors (4011171).

631020592381 is a wasteful number, since it uses less digits than its factorization.

631020592381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011170.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 631020592381 in words is "six hundred thirty-one billion, twenty million, five hundred ninety-two thousand, three hundred eighty-one".