51111009974489 has 2 divisors, whose sum is σ = 51111009974490. Its totient is φ = 51111009974488.

The previous prime is 51111009974477. The next prime is 51111009974501. The reversal of 51111009974489 is 98447990011115.

It is a balanced prime because it is at equal distance from previous prime (51111009974477) and next prime (51111009974501).

It can be written as a sum of positive squares in only one way, i.e., 51101266705225 + 9743269264 = 7148515^2 + 98708^2 .

It is a cyclic number.

It is not a de Polignac number, because 51111009974489 - 2²⁴ = 51110993197273 is a prime.

It is a super-2 number, since 2×51111009974489² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51111009974389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25555504987244 + 25555504987245.

It is an arithmetic number, because the mean of its divisors is an integer number (25555504987245).

Almost surely, 2^{51111009974489} is an apocalyptic number.

It is an amenable number.

51111009974489 is a deficient number, since it is larger than the sum of its proper divisors (1).

51111009974489 is an equidigital number, since it uses as much as digits as its factorization.

51111009974489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 59.

The spelling of 51111009974489 in words is "fifty-one trillion, one hundred eleven billion, nine million, nine hundred seventy-four thousand, four hundred eighty-nine".