51116623 has 4 divisors (see below), whose sum is σ = 51164568. Its totient is φ = 51068680.

The previous prime is 51116621. The next prime is 51116633. The reversal of 51116623 is 32661115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32661115 = 5 ⋅6532223.

It is a cyclic number.

It is not a de Polignac number, because 51116623 - 2¹ = 51116621 is a prime.

It is a super-2 number, since 2×51116623² = 5225818293848258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51116621) 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, 22336 + ... + 24517.

It is an arithmetic number, because the mean of its divisors is an integer number (12791142).

Almost surely, 2^51116623 is an apocalyptic number.

51116623 is a deficient number, since it is larger than the sum of its proper divisors (47945).

51116623 is a wasteful number, since it uses less digits than its factorization.

51116623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47944.

The product of its digits is 1080, while the sum is 25.

The square root of 51116623 is about 7149.5890091669. The cubic root of 51116623 is about 371.1254337649.

Adding to 51116623 its reverse (32661115), we get a palindrome (83777738).

The spelling of 51116623 in words is "fifty-one million, one hundred sixteen thousand, six hundred twenty-three".