1638130431 has 16 divisors (see below), whose sum is σ = 2497165568. Its totient is φ = 935712000.

The previous prime is 1638130423. The next prime is 1638130463. The reversal of 1638130431 is 1340318361.

It is not a de Polignac number, because 1638130431 - 2³ = 1638130423 is a prime.

It is a super-2 number, since 2×1638130431² = 5366942617936491522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638130411) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 46191 + ... + 73551.

It is an arithmetic number, because the mean of its divisors is an integer number (156072848).

Almost surely, 2^1638130431 is an apocalyptic number.

1638130431 is a deficient number, since it is larger than the sum of its proper divisors (859035137).

1638130431 is a wasteful number, since it uses less digits than its factorization.

1638130431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30222.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1638130431 is about 40473.8240224469. The cubic root of 1638130431 is about 1178.8254210260.

Adding to 1638130431 its reverse (1340318361), we get a palindrome (2978448792).

The spelling of 1638130431 in words is "one billion, six hundred thirty-eight million, one hundred thirty thousand, four hundred thirty-one".