631551223 has 2 divisors, whose sum is σ = 631551224. Its totient is φ = 631551222.

The previous prime is 631551211. The next prime is 631551253. The reversal of 631551223 is 322155136.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631551223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631551191 and 631551200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631551253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315775611 + 315775612.

It is an arithmetic number, because the mean of its divisors is an integer number (315775612).

Almost surely, 2^631551223 is an apocalyptic number.

631551223 is a deficient number, since it is larger than the sum of its proper divisors (1).

631551223 is an equidigital number, since it uses as much as digits as its factorization.

631551223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 28.

The square root of 631551223 is about 25130.6828995951. The cubic root of 631551223 is about 857.9649117275.

The spelling of 631551223 in words is "six hundred thirty-one million, five hundred fifty-one thousand, two hundred twenty-three".