631191073 has 2 divisors, whose sum is σ = 631191074. Its totient is φ = 631191072.

The previous prime is 631191037. The next prime is 631191101. The reversal of 631191073 is 370191136.

631191073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (631191037) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 533240464 + 97950609 = 23092^2 + 9897^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631191073 is a prime.

It is not a weakly prime, because it can be changed into another prime (631191373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315595536 + 315595537.

It is an arithmetic number, because the mean of its divisors is an integer number (315595537).

Almost surely, 2^631191073 is an apocalyptic number.

It is an amenable number.

631191073 is a deficient number, since it is larger than the sum of its proper divisors (1).

631191073 is an equidigital number, since it uses as much as digits as its factorization.

631191073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 631191073 is about 25123.5163343032. The cubic root of 631191073 is about 857.8017923021.

The spelling of 631191073 in words is "six hundred thirty-one million, one hundred ninety-one thousand, seventy-three".