1631325021 has 16 divisors (see below), whose sum is σ = 2242965504. Its totient is φ = 1054067184.

The previous prime is 1631324993. The next prime is 1631325037. The reversal of 1631325021 is 1205231361.

It is not a de Polignac number, because 1631325021 - 2¹⁰ = 1631323997 is a prime.

It is a super-2 number, since 2×1631325021² = 5322442648281300882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1631324982 and 1631325000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631325061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41641 + ... + 70686.

It is an arithmetic number, because the mean of its divisors is an integer number (140185344).

Almost surely, 2^1631325021 is an apocalyptic number.

It is an amenable number.

1631325021 is a deficient number, since it is larger than the sum of its proper divisors (611640483).

1631325021 is a wasteful number, since it uses less digits than its factorization.

1631325021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112480.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1631325021 is about 40389.6647794953. The cubic root of 1631325021 is about 1177.1907271477.

Adding to 1631325021 its reverse (1205231361), we get a palindrome (2836556382).

The spelling of 1631325021 in words is "one billion, six hundred thirty-one million, three hundred twenty-five thousand, twenty-one".