1161101020 has 48 divisors (see below), whose sum is σ = 2717638560. Its totient is φ = 414111744.

The previous prime is 1161101009. The next prime is 1161101059. The reversal of 1161101020 is 201011611.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83409 + ... + 96328.

It is an arithmetic number, because the mean of its divisors is an integer number (56617470).

Almost surely, 2^1161101020 is an apocalyptic number.

1161101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161101020 is an abundant number, since it is smaller than the sum of its proper divisors (1556537540).

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

1161101020 is a wasteful number, since it uses less digits than its factorization.

1161101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179782 (or 179780 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1161101020 is about 34074.9324283996. The cubic root of 1161101020 is about 1051.0499007179.

Adding to 1161101020 its reverse (201011611), we get a palindrome (1362112631).

The spelling of 1161101020 in words is "one billion, one hundred sixty-one million, one hundred one thousand, twenty".