51350891 has 2 divisors, whose sum is σ = 51350892. Its totient is φ = 51350890.

The previous prime is 51350861. The next prime is 51350903. The reversal of 51350891 is 19805315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51350891 - 2²² = 47156587 is a prime.

It is not a weakly prime, because it can be changed into another prime (51350801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25675445 + 25675446.

It is an arithmetic number, because the mean of its divisors is an integer number (25675446).

Almost surely, 2^51350891 is an apocalyptic number.

51350891 is a deficient number, since it is larger than the sum of its proper divisors (1).

51350891 is an equidigital number, since it uses as much as digits as its factorization.

51350891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 51350891 is about 7165.9536001847. The cubic root of 51350891 is about 371.6915270449.

The spelling of 51350891 in words is "fifty-one million, three hundred fifty thousand, eight hundred ninety-one".