51351439 has 2 divisors, whose sum is σ = 51351440. Its totient is φ = 51351438.

The previous prime is 51351437. The next prime is 51351451. The reversal of 51351439 is 93415315.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51351439 - 2¹ = 51351437 is a prime.

Together with 51351437, it forms a pair of twin primes.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 51351439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51351437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25675719 + 25675720.

It is an arithmetic number, because the mean of its divisors is an integer number (25675720).

Almost surely, 2^51351439 is an apocalyptic number.

51351439 is a deficient number, since it is larger than the sum of its proper divisors (1).

51351439 is an equidigital number, since it uses as much as digits as its factorization.

51351439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 31.

The square root of 51351439 is about 7165.9918364453. The cubic root of 51351439 is about 371.6928492305.

The spelling of 51351439 in words is "fifty-one million, three hundred fifty-one thousand, four hundred thirty-nine".