513232031621 has 4 divisors (see below), whose sum is σ = 513234989772. Its totient is φ = 513229073472.

The previous prime is 513232031617. The next prime is 513232031623. The reversal of 513232031621 is 126130232315.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126130232315 = 5 ⋅25226046463.

It can be written as a sum of positive squares in 2 ways, for example, as 23352424225 + 489879607396 = 152815^2 + 699914^2 .

It is a cyclic number.

It is not a de Polignac number, because 513232031621 - 2² = 513232031617 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 (513232031623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1201460 + ... + 1571613.

It is an arithmetic number, because the mean of its divisors is an integer number (128308747443).

Almost surely, 2^513232031621 is an apocalyptic number.

It is an amenable number.

513232031621 is a deficient number, since it is larger than the sum of its proper divisors (2958151).

513232031621 is a wasteful number, since it uses less digits than its factorization.

513232031621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958150.

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 513232031621 its reverse (126130232315), we get a palindrome (639362263936).

The spelling of 513232031621 in words is "five hundred thirteen billion, two hundred thirty-two million, thirty-one thousand, six hundred twenty-one".