631351823 has 2 divisors, whose sum is σ = 631351824. Its totient is φ = 631351822.

The previous prime is 631351813. The next prime is 631351841. The reversal of 631351823 is 328153136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631351823 - 2⁴ = 631351807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631351823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631351813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315675911 + 315675912.

It is an arithmetic number, because the mean of its divisors is an integer number (315675912).

Almost surely, 2^631351823 is an apocalyptic number.

631351823 is a deficient number, since it is larger than the sum of its proper divisors (1).

631351823 is an equidigital number, since it uses as much as digits as its factorization.

631351823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 631351823 is about 25126.7153245306. The cubic root of 631351823 is about 857.8746069852.

The spelling of 631351823 in words is "six hundred thirty-one million, three hundred fifty-one thousand, eight hundred twenty-three".