51461075891 has 2 divisors, whose sum is σ = 51461075892. Its totient is φ = 51461075890.

The previous prime is 51461075881. The next prime is 51461075999. The reversal of 51461075891 is 19857016415.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51461075891 is a prime.

It is a super-2 number, since 2×51461075891² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51461075801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25730537945 + 25730537946.

It is an arithmetic number, because the mean of its divisors is an integer number (25730537946).

Almost surely, 2^51461075891 is an apocalyptic number.

51461075891 is a deficient number, since it is larger than the sum of its proper divisors (1).

51461075891 is an equidigital number, since it uses as much as digits as its factorization.

51461075891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 47.

The spelling of 51461075891 in words is "fifty-one billion, four hundred sixty-one million, seventy-five thousand, eight hundred ninety-one".