1161472021 has 4 divisors (see below), whose sum is σ = 1161644652. Its totient is φ = 1161299392.

The previous prime is 1161471991. The next prime is 1161472043. The reversal of 1161472021 is 1202741611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1042967025 + 118504996 = 32295^2 + 10886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161472021 - 2⁵ = 1161471989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161472321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75796 + ... + 89821.

It is an arithmetic number, because the mean of its divisors is an integer number (290411163).

Almost surely, 2^1161472021 is an apocalyptic number.

It is an amenable number.

1161472021 is a deficient number, since it is larger than the sum of its proper divisors (172631).

1161472021 is an equidigital number, since it uses as much as digits as its factorization.

1161472021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172630.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1161472021 is about 34080.3758928801. The cubic root of 1161472021 is about 1051.1618344294.

The spelling of 1161472021 in words is "one billion, one hundred sixty-one million, four hundred seventy-two thousand, twenty-one".