631663101 has 12 divisors (see below), whose sum is σ = 966073212. Its totient is φ = 396337536.

The previous prime is 631663079. The next prime is 631663159. The reversal of 631663101 is 101366136.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 384356025 + 247307076 = 19605^2 + 15726^2 .

It is not a de Polignac number, because 631663101 - 2⁹ = 631662589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631463101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2064106 + ... + 2064411.

It is an arithmetic number, because the mean of its divisors is an integer number (80506101).

Almost surely, 2^631663101 is an apocalyptic number.

It is an amenable number.

631663101 is a deficient number, since it is larger than the sum of its proper divisors (334410111).

631663101 is a wasteful number, since it uses less digits than its factorization.

631663101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4128540 (or 4128537 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 631663101 is about 25132.9087254142. The cubic root of 631663101 is about 858.0155709760.

The spelling of 631663101 in words is "six hundred thirty-one million, six hundred sixty-three thousand, one hundred one".