115781123 has 4 divisors (see below), whose sum is σ = 116291400. Its totient is φ = 115270848.

The previous prime is 115781119. The next prime is 115781143. The reversal of 115781123 is 321187511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 115781123 - 2² = 115781119 is a prime.

It is a super-2 number, since 2×115781123² = 26810536886282258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115781143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254798 + ... + 255251.

It is an arithmetic number, because the mean of its divisors is an integer number (29072850).

Almost surely, 2^115781123 is an apocalyptic number.

115781123 is a deficient number, since it is larger than the sum of its proper divisors (510277).

115781123 is an equidigital number, since it uses as much as digits as its factorization.

115781123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510276.

The product of its digits is 1680, while the sum is 29.

The square root of 115781123 is about 10760.1637069331. The cubic root of 115781123 is about 487.3929607641.

The spelling of 115781123 in words is "one hundred fifteen million, seven hundred eighty-one thousand, one hundred twenty-three".