631143290 has 8 divisors (see below), whose sum is σ = 1136057940. Its totient is φ = 252457312.

The previous prime is 631143287. The next prime is 631143301. The reversal of 631143290 is 92341136.

It can be written as a sum of positive squares in 2 ways, for example, as 610139401 + 21003889 = 24701^2 + 4583^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 31557155 + ... + 31557174.

Almost surely, 2^631143290 is an apocalyptic number.

631143290 is a deficient number, since it is larger than the sum of its proper divisors (504914650).

631143290 is a wasteful number, since it uses less digits than its factorization.

631143290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63114336.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 631143290 is about 25122.5653546767. The cubic root of 631143290 is about 857.7801457257.

The spelling of 631143290 in words is "six hundred thirty-one million, one hundred forty-three thousand, two hundred ninety".