631947249 has 12 divisors (see below), whose sum is σ = 930036276. Its totient is φ = 413348832.

The previous prime is 631947247. The next prime is 631947257. The reversal of 631947249 is 942749136.

It is a happy number.

631947249 is a `hidden beast` number, since 631 + 9 + 4 + 7 + 2 + 4 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 582498225 + 49449024 = 24135^2 + 7032^2 .

It is not a de Polignac number, because 631947249 - 2¹ = 631947247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631947247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 661942 + ... + 662895.

It is an arithmetic number, because the mean of its divisors is an integer number (77503023).

Almost surely, 2^631947249 is an apocalyptic number.

It is an amenable number.

631947249 is a deficient number, since it is larger than the sum of its proper divisors (298089027).

631947249 is a wasteful number, since it uses less digits than its factorization.

631947249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324896 (or 1324893 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 631947249 is about 25138.5609970022. The cubic root of 631947249 is about 858.1442085676.

The spelling of 631947249 in words is "six hundred thirty-one million, nine hundred forty-seven thousand, two hundred forty-nine".