51616889 has 4 divisors (see below), whose sum is σ = 51631440. Its totient is φ = 51602340.

The previous prime is 51616883. The next prime is 51616921. The reversal of 51616889 is 98861615.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98861615 = 5 ⋅19772323.

It is a cyclic number.

It is not a de Polignac number, because 51616889 - 2¹² = 51612793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51616883) 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, 1922 + ... + 10340.

It is an arithmetic number, because the mean of its divisors is an integer number (12907860).

Almost surely, 2^51616889 is an apocalyptic number.

It is an amenable number.

51616889 is a deficient number, since it is larger than the sum of its proper divisors (14551).

51616889 is an equidigital number, since it uses as much as digits as its factorization.

51616889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14550.

The product of its digits is 103680, while the sum is 44.

The square root of 51616889 is about 7184.4894738596. The cubic root of 51616889 is about 372.3322103649.

The spelling of 51616889 in words is "fifty-one million, six hundred sixteen thousand, eight hundred eighty-nine".