51071267789 has 4 divisors (see below), whose sum is σ = 51073546524. Its totient is φ = 51068989056.

The previous prime is 51071267749. The next prime is 51071267833. The reversal of 51071267789 is 98776217015.

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 26709364900 + 24361902889 = 163430^2 + 156083^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51071267789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51071267789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51071267749) 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, 1105412 + ... + 1150685.

It is an arithmetic number, because the mean of its divisors is an integer number (12768386631).

Almost surely, 2^51071267789 is an apocalyptic number.

It is an amenable number.

51071267789 is a deficient number, since it is larger than the sum of its proper divisors (2278735).

51071267789 is a wasteful number, since it uses less digits than its factorization.

51071267789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278734.

The product of its (nonzero) digits is 1481760, while the sum is 53.

The spelling of 51071267789 in words is "fifty-one billion, seventy-one million, two hundred sixty-seven thousand, seven hundred eighty-nine".