51017121149 has 2 divisors, whose sum is σ = 51017121150. Its totient is φ = 51017121148.

The previous prime is 51017121109. The next prime is 51017121151. The reversal of 51017121149 is 94112171015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43501444900 + 7515676249 = 208570^2 + 86693^2 .

It is a cyclic number.

It is not a de Polignac number, because 51017121149 - 2²⁸ = 50748685693 is a prime.

Together with 51017121151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51017121109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25508560574 + 25508560575.

It is an arithmetic number, because the mean of its divisors is an integer number (25508560575).

Almost surely, 2^51017121149 is an apocalyptic number.

It is an amenable number.

51017121149 is a deficient number, since it is larger than the sum of its proper divisors (1).

51017121149 is an equidigital number, since it uses as much as digits as its factorization.

51017121149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 32.

The spelling of 51017121149 in words is "fifty-one billion, seventeen million, one hundred twenty-one thousand, one hundred forty-nine".