1631303644 has 6 divisors (see below), whose sum is σ = 2854781384. Its totient is φ = 815651820.

The previous prime is 1631303617. The next prime is 1631303651. The reversal of 1631303644 is 4463031361.

It is a happy number.

It is a super-2 number, since 2×1631303644² = 5322303157855357472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203912952 + ... + 203912959.

Almost surely, 2^1631303644 is an apocalyptic number.

It is an amenable number.

1631303644 is a deficient number, since it is larger than the sum of its proper divisors (1223477740).

1631303644 is a wasteful number, since it uses less digits than its factorization.

1631303644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407825915 (or 407825913 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 1631303644 is about 40389.4001440972. The cubic root of 1631303644 is about 1177.1855851280.

The spelling of 1631303644 in words is "one billion, six hundred thirty-one million, three hundred three thousand, six hundred forty-four".