631085249 has 2 divisors, whose sum is σ = 631085250. Its totient is φ = 631085248.

The previous prime is 631085239. The next prime is 631085263. The reversal of 631085249 is 942580136.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 467424400 + 163660849 = 21620^2 + 12793^2 .

It is a cyclic number.

It is not a de Polignac number, because 631085249 - 2¹⁶ = 631019713 is a prime.

It is equal to p_32860676 and since 631085249 and 32860676 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (631085239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315542624 + 315542625.

It is an arithmetic number, because the mean of its divisors is an integer number (315542625).

Almost surely, 2^631085249 is an apocalyptic number.

It is an amenable number.

631085249 is a deficient number, since it is larger than the sum of its proper divisors (1).

631085249 is an equidigital number, since it uses as much as digits as its factorization.

631085249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 631085249 is about 25121.4101714056. The cubic root of 631085249 is about 857.7538506173.

The spelling of 631085249 in words is "six hundred thirty-one million, eighty-five thousand, two hundred forty-nine".