1161511242 has 16 divisors (see below), whose sum is σ = 2328392640. Its totient is φ = 386275392.

The previous prime is 1161511207. The next prime is 1161511259. The reversal of 1161511242 is 2421151611.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 220942 + ... + 226137.

It is an arithmetic number, because the mean of its divisors is an integer number (145524540).

Almost surely, 2^1161511242 is an apocalyptic number.

1161511242 is an abundant number, since it is smaller than the sum of its proper divisors (1166881398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161511242 is a wasteful number, since it uses less digits than its factorization.

1161511242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447517.

The product of its digits is 480, while the sum is 24.

The square root of 1161511242 is about 34080.9513071452. The cubic root of 1161511242 is about 1051.1736662983.

Adding to 1161511242 its reverse (2421151611), we get a palindrome (3582662853).

The spelling of 1161511242 in words is "one billion, one hundred sixty-one million, five hundred eleven thousand, two hundred forty-two".