51156839 has 2 divisors, whose sum is σ = 51156840. Its totient is φ = 51156838.

The previous prime is 51156823. The next prime is 51156863. The reversal of 51156839 is 93865115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51156839 - 2⁴ = 51156823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51150839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25578419 + 25578420.

It is an arithmetic number, because the mean of its divisors is an integer number (25578420).

Almost surely, 2^51156839 is an apocalyptic number.

51156839 is a deficient number, since it is larger than the sum of its proper divisors (1).

51156839 is an equidigital number, since it uses as much as digits as its factorization.

51156839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 38.

The square root of 51156839 is about 7152.4009255634. The cubic root of 51156839 is about 371.2227358893. Note that the first 3 decimals are identical.

The spelling of 51156839 in words is "fifty-one million, one hundred fifty-six thousand, eight hundred thirty-nine".