51436739 has 2 divisors, whose sum is σ = 51436740. Its totient is φ = 51436738.

The previous prime is 51436727. The next prime is 51436789. The reversal of 51436739 is 93763415.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51436739 - 2¹² = 51432643 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51436709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25718369 + 25718370.

It is an arithmetic number, because the mean of its divisors is an integer number (25718370).

Almost surely, 2^51436739 is an apocalyptic number.

51436739 is a deficient number, since it is larger than the sum of its proper divisors (1).

51436739 is an equidigital number, since it uses as much as digits as its factorization.

51436739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 38.

The square root of 51436739 is about 7171.9410901094. The cubic root of 51436739 is about 371.8985420117.

The spelling of 51436739 in words is "fifty-one million, four hundred thirty-six thousand, seven hundred thirty-nine".