51081739 has 2 divisors, whose sum is σ = 51081740. Its totient is φ = 51081738.

The previous prime is 51081733. The next prime is 51081743. The reversal of 51081739 is 93718015.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51081739 - 2¹⁷ = 50950667 is a prime.

It is not a weakly prime, because it can be changed into another prime (51081733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25540869 + 25540870.

It is an arithmetic number, because the mean of its divisors is an integer number (25540870).

Almost surely, 2^51081739 is an apocalyptic number.

51081739 is a deficient number, since it is larger than the sum of its proper divisors (1).

51081739 is an equidigital number, since it uses as much as digits as its factorization.

51081739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 51081739 is about 7147.1490120187. The cubic root of 51081739 is about 371.0409910075.

The spelling of 51081739 in words is "fifty-one million, eighty-one thousand, seven hundred thirty-nine".