1631134621 has 8 divisors (see below), whose sum is σ = 1636145784. Its totient is φ = 1626132480.

The previous prime is 1631134619. The next prime is 1631134627. The reversal of 1631134621 is 1264311361.

It can be written as a sum of positive squares in 4 ways, for example, as 546156900 + 1084977721 = 23370^2 + 32939^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1631134621 - 2¹ = 1631134619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1631134621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631134627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534861 + ... + 537901.

It is an arithmetic number, because the mean of its divisors is an integer number (204518223).

Almost surely, 2^1631134621 is an apocalyptic number.

It is an amenable number.

1631134621 is a deficient number, since it is larger than the sum of its proper divisors (5011163).

1631134621 is an equidigital number, since it uses as much as digits as its factorization.

1631134621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4511.

The product of its digits is 2592, while the sum is 28.

The square root of 1631134621 is about 40387.3076720893. The cubic root of 1631134621 is about 1177.1449267846.

Adding to 1631134621 its reverse (1264311361), we get a palindrome (2895445982).

The spelling of 1631134621 in words is "one billion, six hundred thirty-one million, one hundred thirty-four thousand, six hundred twenty-one".