1161278154 has 16 divisors (see below), whose sum is σ = 2580618240. Its totient is φ = 387092700.

The previous prime is 1161278147. The next prime is 1161278203. The reversal of 1161278154 is 4518721611.

1161278154 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10752522 + ... + 10752629.

It is an arithmetic number, because the mean of its divisors is an integer number (161288640).

Almost surely, 2^1161278154 is an apocalyptic number.

1161278154 is an abundant number, since it is smaller than the sum of its proper divisors (1419340086).

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

1161278154 is a wasteful number, since it uses less digits than its factorization.

1161278154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21505162 (or 21505156 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 1161278154 is about 34077.5315127138. The cubic root of 1161278154 is about 1051.1033463134.

Adding to 1161278154 its reverse (4518721611), we get a palindrome (5679999765).

The spelling of 1161278154 in words is "one billion, one hundred sixty-one million, two hundred seventy-eight thousand, one hundred fifty-four".