631276021 has 4 divisors (see below), whose sum is σ = 638369100. Its totient is φ = 624182944.

The previous prime is 631276013. The next prime is 631276027. The reversal of 631276021 is 120672136.

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 227708100 + 403567921 = 15090^2 + 20089^2 .

It is a cyclic number.

It is not a de Polignac number, because 631276021 - 2³ = 631276013 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 (631276027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3546406 + ... + 3546583.

It is an arithmetic number, because the mean of its divisors is an integer number (159592275).

Almost surely, 2^631276021 is an apocalyptic number.

It is an amenable number.

631276021 is a deficient number, since it is larger than the sum of its proper divisors (7093079).

631276021 is an equidigital number, since it uses as much as digits as its factorization.

631276021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7093078.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 631276021 is about 25125.2068847204. The cubic root of 631276021 is about 857.8402726087.

The spelling of 631276021 in words is "six hundred thirty-one million, two hundred seventy-six thousand, twenty-one".