631075609 has 2 divisors, whose sum is σ = 631075610. Its totient is φ = 631075608.

The previous prime is 631075603. The next prime is 631075631. The reversal of 631075609 is 906570136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 494840025 + 136235584 = 22245^2 + 11672^2 .

It is a cyclic number.

It is not a de Polignac number, because 631075609 - 2²¹ = 628978457 is a prime.

It is not a weakly prime, because it can be changed into another prime (631075603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315537804 + 315537805.

It is an arithmetic number, because the mean of its divisors is an integer number (315537805).

Almost surely, 2^631075609 is an apocalyptic number.

It is an amenable number.

631075609 is a deficient number, since it is larger than the sum of its proper divisors (1).

631075609 is an equidigital number, since it uses as much as digits as its factorization.

631075609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 631075609 is about 25121.2183024630. The cubic root of 631075609 is about 857.7494831201.

The spelling of 631075609 in words is "six hundred thirty-one million, seventy-five thousand, six hundred nine".