1161321513 has 16 divisors (see below), whose sum is σ = 1689816000. Its totient is φ = 703572480.

The previous prime is 1161321487. The next prime is 1161321523. The reversal of 1161321513 is 3151231611.

It is not a de Polignac number, because 1161321513 - 2⁵ = 1161321481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161321523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123813 + ... + 132861.

It is an arithmetic number, because the mean of its divisors is an integer number (105613500).

Almost surely, 2^1161321513 is an apocalyptic number.

It is an amenable number.

1161321513 is a deficient number, since it is larger than the sum of its proper divisors (528494487).

1161321513 is a wasteful number, since it uses less digits than its factorization.

1161321513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12952.

The product of its digits is 540, while the sum is 24.

The square root of 1161321513 is about 34078.1676884189. The cubic root of 1161321513 is about 1051.1164279404.

The spelling of 1161321513 in words is "one billion, one hundred sixty-one million, three hundred twenty-one thousand, five hundred thirteen".