631629157 has 8 divisors (see below), whose sum is σ = 636169176. Its totient is φ = 627105792.

The previous prime is 631629127. The next prime is 631629181. The reversal of 631629157 is 751926136.

It can be written as a sum of positive squares in 4 ways, for example, as 330294276 + 301334881 = 18174^2 + 17359^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 631629157 - 2¹⁹ = 631104869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631629127) 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, 77593 + ... + 85345.

It is an arithmetic number, because the mean of its divisors is an integer number (79521147).

Almost surely, 2^631629157 is an apocalyptic number.

It is an amenable number.

631629157 is a deficient number, since it is larger than the sum of its proper divisors (4540019).

631629157 is a wasteful number, since it uses less digits than its factorization.

631629157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8327.

The product of its digits is 68040, while the sum is 40.

The square root of 631629157 is about 25132.2334264188. The cubic root of 631629157 is about 858.0002014949. Note that the first 3 decimals are identical.

The spelling of 631629157 in words is "six hundred thirty-one million, six hundred twenty-nine thousand, one hundred fifty-seven".