1631140621 has 6 divisors (see below), whose sum is σ = 1792906766. Its totient is φ = 1482855000.

The previous prime is 1631140601. The next prime is 1631140631. The reversal of 1631140621 is 1260411361.

It can be written as a sum of positive squares in only one way, i.e., 1594404900 + 36735721 = 39930^2 + 6061^2 .

It is not a de Polignac number, because 1631140621 - 2⁹ = 1631140109 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 (1631140601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6740130 + ... + 6740371.

Almost surely, 2^1631140621 is an apocalyptic number.

1631140621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1631140621 is a deficient number, since it is larger than the sum of its proper divisors (161766145).

1631140621 is a wasteful number, since it uses less digits than its factorization.

1631140621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13480523 (or 13480512 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1631140621 is about 40387.3819527832. The cubic root of 1631140621 is about 1177.1463701277.

Adding to 1631140621 its reverse (1260411361), we get a palindrome (2891551982).

The spelling of 1631140621 in words is "one billion, six hundred thirty-one million, one hundred forty thousand, six hundred twenty-one".