631645251242 has 4 divisors (see below), whose sum is σ = 947467876866. Its totient is φ = 315822625620.

The previous prime is 631645251239. The next prime is 631645251269. The reversal of 631645251242 is 242152546136.

631645251242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 612526934881 + 19118316361 = 782641^2 + 138269^2 .

It is a super-3 number, since 3×631645251242³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 631645251242.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157911312809 + ... + 157911312812.

Almost surely, 2^631645251242 is an apocalyptic number.

631645251242 is a deficient number, since it is larger than the sum of its proper divisors (315822625624).

631645251242 is a wasteful number, since it uses less digits than its factorization.

631645251242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315822625623.

The product of its digits is 345600, while the sum is 41.

Adding to 631645251242 its reverse (242152546136), we get a palindrome (873797797378).

The spelling of 631645251242 in words is "six hundred thirty-one billion, six hundred forty-five million, two hundred fifty-one thousand, two hundred forty-two".