51403789 has 4 divisors (see below), whose sum is σ = 51532380. Its totient is φ = 51275200.

The previous prime is 51403783. The next prime is 51403823. The reversal of 51403789 is 98730415.

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 51194025 + 209764 = 7155^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 51403789 - 2⁷ = 51403661 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 (51403783) 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, 63694 + ... + 64495.

It is an arithmetic number, because the mean of its divisors is an integer number (12883095).

Almost surely, 2^51403789 is an apocalyptic number.

It is an amenable number.

51403789 is a deficient number, since it is larger than the sum of its proper divisors (128591).

51403789 is a wasteful number, since it uses less digits than its factorization.

51403789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128590.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 51403789 is about 7169.6435755203. The cubic root of 51403789 is about 371.8191132172.

The spelling of 51403789 in words is "fifty-one million, four hundred three thousand, seven hundred eighty-nine".