51036621 has 4 divisors (see below), whose sum is σ = 68048832. Its totient is φ = 34024412.

The previous prime is 51036619. The next prime is 51036631. The reversal of 51036621 is 12663015.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51036621 - 2¹ = 51036619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51036591 and 51036600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51036611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8506101 + ... + 8506106.

It is an arithmetic number, because the mean of its divisors is an integer number (17012208).

Almost surely, 2^51036621 is an apocalyptic number.

It is an amenable number.

51036621 is a deficient number, since it is larger than the sum of its proper divisors (17012211).

51036621 is a wasteful number, since it uses less digits than its factorization.

51036621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17012210.

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

The square root of 51036621 is about 7143.9919512833. The cubic root of 51036621 is about 370.9317180468.

Adding to 51036621 its reverse (12663015), we get a palindrome (63699636).

The spelling of 51036621 in words is "fifty-one million, thirty-six thousand, six hundred twenty-one".