1156601220 has 24 divisors (see below), whose sum is σ = 3238483584. Its totient is φ = 308426976.

The previous prime is 1156601213. The next prime is 1156601233. The reversal of 1156601220 is 221066511.

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, 9638284 + ... + 9638403.

It is an arithmetic number, because the mean of its divisors is an integer number (134936816).

Almost surely, 2^1156601220 is an apocalyptic number.

1156601220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1156601220 is an abundant number, since it is smaller than the sum of its proper divisors (2081882364).

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

1156601220 is a wasteful number, since it uses less digits than its factorization.

1156601220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19276699 (or 19276697 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1156601220 is about 34008.8403213047. The cubic root of 1156601220 is about 1049.6903758271.

Adding to 1156601220 its reverse (221066511), we get a palindrome (1377667731).

The spelling of 1156601220 in words is "one billion, one hundred fifty-six million, six hundred one thousand, two hundred twenty".