631512142 has 4 divisors (see below), whose sum is σ = 947268216. Its totient is φ = 315756070.

The previous prime is 631512131. The next prime is 631512143. The reversal of 631512142 is 241215136.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631512143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157878034 + ... + 157878037.

It is an arithmetic number, because the mean of its divisors is an integer number (236817054).

Almost surely, 2^631512142 is an apocalyptic number.

631512142 is a deficient number, since it is larger than the sum of its proper divisors (315756074).

631512142 is a wasteful number, since it uses less digits than its factorization.

631512142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315756073.

The product of its digits is 1440, while the sum is 25.

The square root of 631512142 is about 25129.9053320939. The cubic root of 631512142 is about 857.9472141299.

Adding to 631512142 its reverse (241215136), we get a palindrome (872727278).

The spelling of 631512142 in words is "six hundred thirty-one million, five hundred twelve thousand, one hundred forty-two".