631313093 has 4 divisors (see below), whose sum is σ = 653082540. Its totient is φ = 609543648.

The previous prime is 631313083. The next prime is 631313099. The reversal of 631313093 is 390313136.

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 424442404 + 206870689 = 20602^2 + 14383^2 .

It is a cyclic number.

It is not a de Polignac number, because 631313093 - 2⁶ = 631313029 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: 21769417 = 631313093 / (6 + 3 + 1 + 3 + 1 + 3 + 0 + 9 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631313099) 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, 10884680 + ... + 10884737.

It is an arithmetic number, because the mean of its divisors is an integer number (163270635).

Almost surely, 2^631313093 is an apocalyptic number.

It is an amenable number.

631313093 is a deficient number, since it is larger than the sum of its proper divisors (21769447).

631313093 is a wasteful number, since it uses less digits than its factorization.

631313093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21769446.

The product of its (nonzero) digits is 4374, while the sum is 29.

The square root of 631313093 is about 25125.9446190586. The cubic root of 631313093 is about 857.8570646463.

The spelling of 631313093 in words is "six hundred thirty-one million, three hundred thirteen thousand, ninety-three".