1171645220 has 24 divisors (see below), whose sum is σ = 2467067064. Its totient is φ = 467398656.

The previous prime is 1171645201. The next prime is 1171645261. The reversal of 1171645220 is 225461711.

It can be written as a sum of positive squares in 4 ways, for example, as 73650724 + 1097994496 = 8582^2 + 33136^2 .

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, 71069 + ... + 85988.

It is an arithmetic number, because the mean of its divisors is an integer number (102794461).

Almost surely, 2^1171645220 is an apocalyptic number.

1171645220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1171645220 is an abundant number, since it is smaller than the sum of its proper divisors (1295421844).

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

1171645220 is a wasteful number, since it uses less digits than its factorization.

1171645220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157439 (or 157437 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1171645220 is about 34229.3035278254. The cubic root of 1171645220 is about 1054.2219190490.

The spelling of 1171645220 in words is "one billion, one hundred seventy-one million, six hundred forty-five thousand, two hundred twenty".