51491359 has 2 divisors, whose sum is σ = 51491360. Its totient is φ = 51491358.

The previous prime is 51491357. The next prime is 51491371. The reversal of 51491359 is 95319415.

It is a happy number.

51491359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51491359 - 2¹ = 51491357 is a prime.

Together with 51491357, 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 (51491357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25745679 + 25745680.

It is an arithmetic number, because the mean of its divisors is an integer number (25745680).

Almost surely, 2^51491359 is an apocalyptic number.

51491359 is a deficient number, since it is larger than the sum of its proper divisors (1).

51491359 is an equidigital number, since it uses as much as digits as its factorization.

51491359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 37.

The square root of 51491359 is about 7175.7479749501. The cubic root of 51491359 is about 372.0301335092.

The spelling of 51491359 in words is "fifty-one million, four hundred ninety-one thousand, three hundred fifty-nine".