51339551 has 2 divisors, whose sum is σ = 51339552. Its totient is φ = 51339550.

The previous prime is 51339523. The next prime is 51339553. The reversal of 51339551 is 15593315.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51339551 - 2¹⁰ = 51338527 is a prime.

Together with 51339553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51339553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25669775 + 25669776.

It is an arithmetic number, because the mean of its divisors is an integer number (25669776).

Almost surely, 2^51339551 is an apocalyptic number.

51339551 is a deficient number, since it is larger than the sum of its proper divisors (1).

51339551 is an equidigital number, since it uses as much as digits as its factorization.

51339551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10125, while the sum is 32.

The square root of 51339551 is about 7165.1623149793. The cubic root of 51339551 is about 371.6641643764.

The spelling of 51339551 in words is "fifty-one million, three hundred thirty-nine thousand, five hundred fifty-one".