78090051349 has 2 divisors, whose sum is σ = 78090051350. Its totient is φ = 78090051348.

The previous prime is 78090051337. The next prime is 78090051367. The reversal of 78090051349 is 94315009087.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58203975025 + 19886076324 = 241255^2 + 141018^2 .

It is a cyclic number.

It is not a de Polignac number, because 78090051349 - 2⁵ = 78090051317 is a prime.

It is a super-2 number, since 2×78090051349² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78090051299 and 78090051308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78190051349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39045025674 + 39045025675.

It is an arithmetic number, because the mean of its divisors is an integer number (39045025675).

Almost surely, 2^78090051349 is an apocalyptic number.

It is an amenable number.

78090051349 is a deficient number, since it is larger than the sum of its proper divisors (1).

78090051349 is an equidigital number, since it uses as much as digits as its factorization.

78090051349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 78090051349 in words is "seventy-eight billion, ninety million, fifty-one thousand, three hundred forty-nine".