631764101 has 4 divisors (see below), whose sum is σ = 653549100. Its totient is φ = 609979104.

The previous prime is 631764071. The next prime is 631764113. The reversal of 631764101 is 101467136.

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

It can be written as a sum of positive squares in 2 ways, for example, as 361950625 + 269813476 = 19025^2 + 16426^2 .

It is a cyclic number.

It is not a de Polignac number, because 631764101 - 2⁶ = 631764037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 21784969 = 631764101 / (6 + 3 + 1 + 7 + 6 + 4 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631764131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10892456 + ... + 10892513.

It is an arithmetic number, because the mean of its divisors is an integer number (163387275).

Almost surely, 2^631764101 is an apocalyptic number.

It is an amenable number.

631764101 is a deficient number, since it is larger than the sum of its proper divisors (21784999).

631764101 is a wasteful number, since it uses less digits than its factorization.

631764101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21784998.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 631764101 is about 25134.9179628659. The cubic root of 631764101 is about 858.0612994422.

The spelling of 631764101 in words is "six hundred thirty-one million, seven hundred sixty-four thousand, one hundred one".