631778473 has 4 divisors (see below), whose sum is σ = 632074068. Its totient is φ = 631482880.

The previous prime is 631778461. The next prime is 631778479. The reversal of 631778473 is 374877136.

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

It can be written as a sum of positive squares in 2 ways, for example, as 174160809 + 457617664 = 13197^2 + 21392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631778473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631778479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144568 + ... + 148873.

It is an arithmetic number, because the mean of its divisors is an integer number (158018517).

Almost surely, 2^631778473 is an apocalyptic number.

It is an amenable number.

631778473 is a deficient number, since it is larger than the sum of its proper divisors (295595).

631778473 is a wasteful number, since it uses less digits than its factorization.

631778473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295594.

The product of its digits is 592704, while the sum is 46.

The square root of 631778473 is about 25135.2038583338. The cubic root of 631778473 is about 858.0678060710.

The spelling of 631778473 in words is "six hundred thirty-one million, seven hundred seventy-eight thousand, four hundred seventy-three".