1171161020 has 24 divisors (see below), whose sum is σ = 2463476064. Its totient is φ = 467695296.

The previous prime is 1171160987. The next prime is 1171161049. The reversal of 1171161020 is 201611711.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1171160983 and 1171161001.

It is a congruent 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, 35504 + ... + 60023.

It is an arithmetic number, because the mean of its divisors is an integer number (102644836).

Almost surely, 2^1171161020 is an apocalyptic number.

1171161020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1171161020 is an abundant number, since it is smaller than the sum of its proper divisors (1292315044).

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

1171161020 is a wasteful number, since it uses less digits than its factorization.

1171161020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96149 (or 96147 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 20.

The square root of 1171161020 is about 34222.2299098115. The cubic root of 1171161020 is about 1054.0766746871.

Adding to 1171161020 its reverse (201611711), we get a palindrome (1372772731).

The spelling of 1171161020 in words is "one billion, one hundred seventy-one million, one hundred sixty-one thousand, twenty".