631824401 has 4 divisors (see below), whose sum is σ = 680426292. Its totient is φ = 583222512.

The previous prime is 631824379. The next prime is 631824419. The reversal of 631824401 is 104428136.

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 362864401 + 268960000 = 19049^2 + 16400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631824401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631824481) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 24300926 + ... + 24300951.

It is an arithmetic number, because the mean of its divisors is an integer number (170106573).

Almost surely, 2^631824401 is an apocalyptic number.

It is an amenable number.

631824401 is a deficient number, since it is larger than the sum of its proper divisors (48601891).

631824401 is a wasteful number, since it uses less digits than its factorization.

631824401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48601890.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 631824401 is about 25136.1174607376. The cubic root of 631824401 is about 858.0885983713.

The spelling of 631824401 in words is "six hundred thirty-one million, eight hundred twenty-four thousand, four hundred one".