631905823 has 2 divisors, whose sum is σ = 631905824. Its totient is φ = 631905822.

The previous prime is 631905797. The next prime is 631905839. The reversal of 631905823 is 328509136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631905823 - 2²¹ = 629808671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631905863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315952911 + 315952912.

It is an arithmetic number, because the mean of its divisors is an integer number (315952912).

Almost surely, 2^631905823 is an apocalyptic number.

631905823 is a deficient number, since it is larger than the sum of its proper divisors (1).

631905823 is an equidigital number, since it uses as much as digits as its factorization.

631905823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 631905823 is about 25137.7370302102. The cubic root of 631905823 is about 858.1254568659.

The spelling of 631905823 in words is "six hundred thirty-one million, nine hundred five thousand, eight hundred twenty-three".