51321100189 has 2 divisors, whose sum is σ = 51321100190. Its totient is φ = 51321100188.

The previous prime is 51321100121. The next prime is 51321100319. The reversal of 51321100189 is 98100112315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49999196025 + 1321904164 = 223605^2 + 36358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51321100189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51321100189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51321100489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25660550094 + 25660550095.

It is an arithmetic number, because the mean of its divisors is an integer number (25660550095).

Almost surely, 2^51321100189 is an apocalyptic number.

It is an amenable number.

51321100189 is a deficient number, since it is larger than the sum of its proper divisors (1).

51321100189 is an equidigital number, since it uses as much as digits as its factorization.

51321100189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 31.

The spelling of 51321100189 in words is "fifty-one billion, three hundred twenty-one million, one hundred thousand, one hundred eighty-nine".