51450391 has 2 divisors, whose sum is σ = 51450392. Its totient is φ = 51450390.

The previous prime is 51450353. The next prime is 51450407. The reversal of 51450391 is 19305415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51450391 - 2¹¹ = 51448343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51450341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25725195 + 25725196.

It is an arithmetic number, because the mean of its divisors is an integer number (25725196).

Almost surely, 2^51450391 is an apocalyptic number.

51450391 is a deficient number, since it is larger than the sum of its proper divisors (1).

51450391 is an equidigital number, since it uses as much as digits as its factorization.

51450391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 51450391 is about 7172.8927916148. The cubic root of 51450391 is about 371.9314413873.

It can be divided in two parts, 514 and 50391, that added together give a palindrome (50905).

The spelling of 51450391 in words is "fifty-one million, four hundred fifty thousand, three hundred ninety-one".