115402578209 has 2 divisors, whose sum is σ = 115402578210. Its totient is φ = 115402578208.

The previous prime is 115402578143. The next prime is 115402578211. The reversal of 115402578209 is 902875204511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115394051809 + 8526400 = 339697^2 + 2920^2 .

It is a cyclic number.

It is not a de Polignac number, because 115402578209 - 2¹² = 115402574113 is a prime.

Together with 115402578211, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 115402578209.

It is not a weakly prime, because it can be changed into another prime (115402578299) 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, 57701289104 + 57701289105.

It is an arithmetic number, because the mean of its divisors is an integer number (57701289105).

Almost surely, 2^115402578209 is an apocalyptic number.

It is an amenable number.

115402578209 is a deficient number, since it is larger than the sum of its proper divisors (1).

115402578209 is an equidigital number, since it uses as much as digits as its factorization.

115402578209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 115402578209 in words is "one hundred fifteen billion, four hundred two million, five hundred seventy-eight thousand, two hundred nine".