51356789 has 4 divisors (see below), whose sum is σ = 56025600. Its totient is φ = 46687980.

The previous prime is 51356771. The next prime is 51356797. The reversal of 51356789 is 98765315.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51356789 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 (51356729) 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, 2334389 + ... + 2334410.

It is an arithmetic number, because the mean of its divisors is an integer number (14006400).

Almost surely, 2^51356789 is an apocalyptic number.

It is an amenable number.

51356789 is a deficient number, since it is larger than the sum of its proper divisors (4668811).

51356789 is a wasteful number, since it uses less digits than its factorization.

51356789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4668810.

The product of its digits is 226800, while the sum is 44.

The square root of 51356789 is about 7166.3651176869. The cubic root of 51356789 is about 371.7057569356.

The spelling of 51356789 in words is "fifty-one million, three hundred fifty-six thousand, seven hundred eighty-nine".