1165413123 has 16 divisors (see below), whose sum is σ = 1973186560. Its totient is φ = 665950248.

The previous prime is 1165413107. The next prime is 1165413143. The reversal of 1165413123 is 3213145611.

It is a happy number.

1165413123 is a `hidden beast` number, since 1 + 1 + 654 + 1 + 3 + 1 + 2 + 3 = 666.

It is not a de Polignac number, because 1165413123 - 2⁴ = 1165413107 is a prime.

It is a super-2 number, since 2×1165413123² = 2716375494521226258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165413143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3082915 + ... + 3083292.

It is an arithmetic number, because the mean of its divisors is an integer number (123324160).

Almost surely, 2^1165413123 is an apocalyptic number.

1165413123 is a deficient number, since it is larger than the sum of its proper divisors (807773437).

1165413123 is an equidigital number, since it uses as much as digits as its factorization.

1165413123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6166223 (or 6166217 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1165413123 is about 34138.1476210998. The cubic root of 1165413123 is about 1052.3494248438.

Adding to 1165413123 its reverse (3213145611), we get a palindrome (4378558734).

The spelling of 1165413123 in words is "one billion, one hundred sixty-five million, four hundred thirteen thousand, one hundred twenty-three".