51624253 has 4 divisors (see below), whose sum is σ = 52097980. Its totient is φ = 51150528.

The previous prime is 51624241. The next prime is 51624271. The reversal of 51624253 is 35242615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40615129 + 11009124 = 6373^2 + 3318^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51624253 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 (51628253) 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, 236700 + ... + 236917.

It is an arithmetic number, because the mean of its divisors is an integer number (13024495).

Almost surely, 2^51624253 is an apocalyptic number.

It is an amenable number.

51624253 is a deficient number, since it is larger than the sum of its proper divisors (473727).

51624253 is a wasteful number, since it uses less digits than its factorization.

51624253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473726.

The product of its digits is 7200, while the sum is 28.

The square root of 51624253 is about 7185.0019485036. The cubic root of 51624253 is about 372.3499159652.

Subtracting from 51624253 its sum of digits (28), we obtain a square (51624225 = 7185²).

Adding to 51624253 its reverse (35242615), we get a palindrome (86866868).

The spelling of 51624253 in words is "fifty-one million, six hundred twenty-four thousand, two hundred fifty-three".