631466641 has 9 divisors (see below), whose sum is σ = 684131409. Its totient is φ = 582590736.

The previous prime is 631466639. The next prime is 631466777. The reversal of 631466641 is 146664136.

The square root of 631466641 is 25129.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 26306641 + 605160000 = 5129^2 + 24600^2 .

It is not a de Polignac number, because 631466641 - 2¹ = 631466639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631466641.

It is not an unprimeable number, because it can be changed into a prime (631466611) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 325711 + ... + 327643.

It is an arithmetic number, because the mean of its divisors is an integer number (76014601).

Almost surely, 2^631466641 is an apocalyptic number.

631466641 is the 25129-th square number.

631466641 is the 12565-th centered octagonal number.

It is an amenable number.

631466641 is a deficient number, since it is larger than the sum of its proper divisors (52664768).

631466641 is an frugal number, since it uses more digits than its factorization.

631466641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892 (or 1946 counting only the distinct ones).

The product of its digits is 62208, while the sum is 37.

The cubic root of 631466641 is about 857.9266083536.

The spelling of 631466641 in words is "six hundred thirty-one million, four hundred sixty-six thousand, six hundred forty-one".