631318249 has 2 divisors, whose sum is σ = 631318250. Its totient is φ = 631318248.

The previous prime is 631318229. The next prime is 631318321. The reversal of 631318249 is 942813136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 593409600 + 37908649 = 24360^2 + 6157^2 .

It is a cyclic number.

It is not a de Polignac number, because 631318249 - 2¹¹ = 631316201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631318229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315659124 + 315659125.

It is an arithmetic number, because the mean of its divisors is an integer number (315659125).

Almost surely, 2^631318249 is an apocalyptic number.

It is an amenable number.

631318249 is a deficient number, since it is larger than the sum of its proper divisors (1).

631318249 is an equidigital number, since it uses as much as digits as its factorization.

631318249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 631318249 is about 25126.0472219567. The cubic root of 631318249 is about 857.8594000427.

The spelling of 631318249 in words is "six hundred thirty-one million, three hundred eighteen thousand, two hundred forty-nine".