1631613644 has 12 divisors (see below), whose sum is σ = 2855853000. Its totient is φ = 815655648.

The previous prime is 1631613617. The next prime is 1631613647. The reversal of 1631613644 is 4463161361.

It is not an unprimeable number, because it can be changed into a prime (1631613647) 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, 11474 + ... + 58265.

It is an arithmetic number, because the mean of its divisors is an integer number (237987750).

Almost surely, 2^1631613644 is an apocalyptic number.

It is an amenable number.

1631613644 is a deficient number, since it is larger than the sum of its proper divisors (1224239356).

1631613644 is a wasteful number, since it uses less digits than its factorization.

1631613644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75592 (or 75590 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 1631613644 is about 40393.2376023512. The cubic root of 1631613644 is about 1177.2601480743.

The spelling of 1631613644 in words is "one billion, six hundred thirty-one million, six hundred thirteen thousand, six hundred forty-four".