51252621 has 16 divisors (see below), whose sum is σ = 78201984. Its totient is φ = 29248704.

The previous prime is 51252613. The next prime is 51252623. The reversal of 51252621 is 12625215.

It is a happy number.

It is not a de Polignac number, because 51252621 - 2³ = 51252613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51252591 and 51252600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51252623) 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, 24991 + ... + 26963.

It is an arithmetic number, because the mean of its divisors is an integer number (4887624).

Almost surely, 2^51252621 is an apocalyptic number.

It is an amenable number.

51252621 is a deficient number, since it is larger than the sum of its proper divisors (26949363).

51252621 is a wasteful number, since it uses less digits than its factorization.

51252621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220.

The product of its digits is 1200, while the sum is 24.

The square root of 51252621 is about 7159.0935878783. The cubic root of 51252621 is about 371.4542740948.

Adding to 51252621 its reverse (12625215), we get a palindrome (63877836).

The spelling of 51252621 in words is "fifty-one million, two hundred fifty-two thousand, six hundred twenty-one".