1161156020 has 12 divisors (see below), whose sum is σ = 2438427684. Its totient is φ = 464462400.

The previous prime is 1161156013. The next prime is 1161156043. The reversal of 1161156020 is 206511611.

It can be written as a sum of positive squares in 2 ways, for example, as 468203044 + 692952976 = 21638^2 + 26324^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29028881 + ... + 29028920.

It is an arithmetic number, because the mean of its divisors is an integer number (203202307).

Almost surely, 2^1161156020 is an apocalyptic number.

1161156020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161156020 is an abundant number, since it is smaller than the sum of its proper divisors (1277271664).

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

1161156020 is a wasteful number, since it uses less digits than its factorization.

1161156020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58057810 (or 58057808 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 1161156020 is about 34075.7394637299. The cubic root of 1161156020 is about 1051.0664961248.

Adding to 1161156020 its reverse (206511611), we get a palindrome (1367667631).

The spelling of 1161156020 in words is "one billion, one hundred sixty-one million, one hundred fifty-six thousand, twenty".