1157072209 has 8 divisors (see below), whose sum is σ = 1160559720. Its totient is φ = 1153591296.

The previous prime is 1157072197. The next prime is 1157072221. The reversal of 1157072209 is 9022707511.

It is an interprime number because it is at equal distance from previous prime (1157072197) and next prime (1157072221).

It can be written as a sum of positive squares in 4 ways, for example, as 16524225 + 1140547984 = 4065^2 + 33772^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1157072209 - 2¹⁵ = 1157039441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1157072299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 820497 + ... + 821905.

It is an arithmetic number, because the mean of its divisors is an integer number (145069965).

Almost surely, 2^1157072209 is an apocalyptic number.

It is an amenable number.

1157072209 is a deficient number, since it is larger than the sum of its proper divisors (3487511).

1157072209 is a wasteful number, since it uses less digits than its factorization.

1157072209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3299.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 1157072209 is about 34015.7641248877. The cubic root of 1157072209 is about 1049.8328408123.

The spelling of 1157072209 in words is "one billion, one hundred fifty-seven million, seventy-two thousand, two hundred nine".