115566551 has 2 divisors, whose sum is σ = 115566552. Its totient is φ = 115566550.

The previous prime is 115566547. The next prime is 115566587. The reversal of 115566551 is 155665511.

It is a weak prime.

It is an emirp because it is prime and its reverse (155665511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115566551 - 2² = 115566547 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115566541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57783275 + 57783276.

It is an arithmetic number, because the mean of its divisors is an integer number (57783276).

Almost surely, 2^115566551 is an apocalyptic number.

115566551 is a deficient number, since it is larger than the sum of its proper divisors (1).

115566551 is an equidigital number, since it uses as much as digits as its factorization.

115566551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22500, while the sum is 35.

The square root of 115566551 is about 10750.1884169534. The cubic root of 115566551 is about 487.0916866839.

The spelling of 115566551 in words is "one hundred fifteen million, five hundred sixty-six thousand, five hundred fifty-one".