51623213 has 4 divisors (see below), whose sum is σ = 51657408. Its totient is φ = 51589020.

The previous prime is 51623197. The next prime is 51623227. The reversal of 51623213 is 31232615.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31232615 = 5 ⋅6246523.

It is a cyclic number.

It is not a de Polignac number, because 51623213 - 2⁴ = 51623197 is a prime.

It is a super-2 number, since 2×51623213² = 5329912240886738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51623413) 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, 14723 + ... + 17888.

It is an arithmetic number, because the mean of its divisors is an integer number (12914352).

Almost surely, 2^51623213 is an apocalyptic number.

It is an amenable number.

51623213 is a deficient number, since it is larger than the sum of its proper divisors (34195).

51623213 is a wasteful number, since it uses less digits than its factorization.

51623213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34194.

The product of its digits is 1080, while the sum is 23.

The square root of 51623213 is about 7184.9295751594. The cubic root of 51623213 is about 372.3474155480.

Adding to 51623213 its reverse (31232615), we get a palindrome (82855828).

The spelling of 51623213 in words is "fifty-one million, six hundred twenty-three thousand, two hundred thirteen".