51301252991 has 2 divisors, whose sum is σ = 51301252992. Its totient is φ = 51301252990.

The previous prime is 51301252969. The next prime is 51301253021. The reversal of 51301252991 is 19925210315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51301252991 - 2⁶ = 51301252927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51301252921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25650626495 + 25650626496.

It is an arithmetic number, because the mean of its divisors is an integer number (25650626496).

Almost surely, 2^51301252991 is an apocalyptic number.

51301252991 is a deficient number, since it is larger than the sum of its proper divisors (1).

51301252991 is an equidigital number, since it uses as much as digits as its factorization.

51301252991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 38.

The spelling of 51301252991 in words is "fifty-one billion, three hundred one million, two hundred fifty-two thousand, nine hundred ninety-one".