631781442 has 24 divisors (see below), whose sum is σ = 1370920044. Its totient is φ = 210276864.

The previous prime is 631781399. The next prime is 631781461. The reversal of 631781442 is 244187136.

631781442 is a `hidden beast` number, since 631 + 7 + 8 + 14 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 593848161 + 37933281 = 24369^2 + 6159^2 .

It is a junction number, because it is equal to n+sod(n) for n = 631781397 and 631781406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13963 + ... + 38190.

Almost surely, 2^631781442 is an apocalyptic number.

631781442 is an abundant number, since it is smaller than the sum of its proper divisors (739138602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631781442 is a wasteful number, since it uses less digits than its factorization.

631781442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52834 (or 52831 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 631781442 is about 25135.2629188557. The cubic root of 631781442 is about 858.0691502127.

It can be divided in two parts, 63178 and 1442, that added together give a triangular number (64620 = T₃₅₉).

The spelling of 631781442 in words is "six hundred thirty-one million, seven hundred eighty-one thousand, four hundred forty-two".