631449386 has 4 divisors (see below), whose sum is σ = 947174082. Its totient is φ = 315724692.

The previous prime is 631449373. The next prime is 631449389. The reversal of 631449386 is 683944136.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 625950361 + 5499025 = 25019^2 + 2345^2 .

It is not an unprimeable number, because it can be changed into a prime (631449389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157862345 + ... + 157862348.

Almost surely, 2^631449386 is an apocalyptic number.

631449386 is a deficient number, since it is larger than the sum of its proper divisors (315724696).

631449386 is a wasteful number, since it uses less digits than its factorization.

631449386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315724695.

The product of its digits is 373248, while the sum is 44.

The square root of 631449386 is about 25128.6566692293. The cubic root of 631449386 is about 857.9187939220.

The spelling of 631449386 in words is "six hundred thirty-one million, four hundred forty-nine thousand, three hundred eighty-six".