631491142 has 16 divisors (see below), whose sum is σ = 978671232. Its totient is φ = 305285760.

The previous prime is 631491137. The next prime is 631491149. The reversal of 631491142 is 241194136.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631491149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76488 + ... + 84340.

It is an arithmetic number, because the mean of its divisors is an integer number (61166952).

Almost surely, 2^631491142 is an apocalyptic number.

631491142 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

631491142 is a deficient number, since it is larger than the sum of its proper divisors (347180090).

631491142 is a wasteful number, since it uses less digits than its factorization.

631491142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9183.

The product of its digits is 5184, while the sum is 31.

The square root of 631491142 is about 25129.4874997482. The cubic root of 631491142 is about 857.9377041036.

The spelling of 631491142 in words is "six hundred thirty-one million, four hundred ninety-one thousand, one hundred forty-two".