1161555015 has 8 divisors (see below), whose sum is σ = 1858488048. Its totient is φ = 619496000.

The previous prime is 1161554941. The next prime is 1161555019. The reversal of 1161555015 is 5105551611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1161555015 - 2¹⁵ = 1161522247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161555019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38718486 + ... + 38718515.

It is an arithmetic number, because the mean of its divisors is an integer number (232311006).

Almost surely, 2^1161555015 is an apocalyptic number.

1161555015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1161555015 is a deficient number, since it is larger than the sum of its proper divisors (696933033).

1161555015 is an equidigital number, since it uses as much as digits as its factorization.

1161555015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77437009.

The product of its (nonzero) digits is 3750, while the sum is 30.

The square root of 1161555015 is about 34081.5934926758. The cubic root of 1161555015 is about 1051.1868710627.

The spelling of 1161555015 in words is "one billion, one hundred sixty-one million, five hundred fifty-five thousand, fifteen".