1165401815 has 4 divisors (see below), whose sum is σ = 1398482184. Its totient is φ = 932321448.

The previous prime is 1165401773. The next prime is 1165401847. The reversal of 1165401815 is 5181045611.

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 1165401815 - 2¹⁶ = 1165336279 is a prime.

It is a super-2 number, since 2×1165401815² = 2716322780810588450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 116540177 + ... + 116540186.

It is an arithmetic number, because the mean of its divisors is an integer number (349620546).

Almost surely, 2^1165401815 is an apocalyptic number.

1165401815 is a deficient number, since it is larger than the sum of its proper divisors (233080369).

1165401815 is an equidigital number, since it uses as much as digits as its factorization.

1165401815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233080368.

The product of its (nonzero) digits is 4800, while the sum is 32.

The square root of 1165401815 is about 34137.9819995266. The cubic root of 1165401815 is about 1052.3460211850.

The spelling of 1165401815 in words is "one billion, one hundred sixty-five million, four hundred one thousand, eight hundred fifteen".