51980839 has 2 divisors, whose sum is σ = 51980840. Its totient is φ = 51980838.

The previous prime is 51980821. The next prime is 51980843. The reversal of 51980839 is 93808915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51980839 - 2¹¹ = 51978791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51980795 and 51980804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51980869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25990419 + 25990420.

It is an arithmetic number, because the mean of its divisors is an integer number (25990420).

Almost surely, 2^51980839 is an apocalyptic number.

51980839 is a deficient number, since it is larger than the sum of its proper divisors (1).

51980839 is an equidigital number, since it uses as much as digits as its factorization.

51980839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 51980839 is about 7209.7738522092. The cubic root of 51980839 is about 373.2052647635.

The spelling of 51980839 in words is "fifty-one million, nine hundred eighty thousand, eight hundred thirty-nine".