631557013 has 4 divisors (see below), whose sum is σ = 631832608. Its totient is φ = 631281420.

The previous prime is 631557011. The next prime is 631557049. The reversal of 631557013 is 310755136.

631557013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631557013 - 2¹ = 631557011 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 (631557011) 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, 134331 + ... + 138952.

It is an arithmetic number, because the mean of its divisors is an integer number (157958152).

Almost surely, 2^631557013 is an apocalyptic number.

It is an amenable number.

631557013 is a deficient number, since it is larger than the sum of its proper divisors (275595).

631557013 is a wasteful number, since it uses less digits than its factorization.

631557013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275594.

The product of its (nonzero) digits is 9450, while the sum is 31.

The square root of 631557013 is about 25130.7980971556. The cubic root of 631557013 is about 857.9675336324.

The spelling of 631557013 in words is "six hundred thirty-one million, five hundred fifty-seven thousand, thirteen".