1157209009 has 4 divisors (see below), whose sum is σ = 1262409840. Its totient is φ = 1052008180.

The previous prime is 1157208973. The next prime is 1157209019. The reversal of 1157209009 is 9009027511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9009027511 = 11 ⋅819002501.

It is a cyclic number.

It is not a de Polignac number, because 1157209009 - 2⁹ = 1157208497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1157209019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52600399 + ... + 52600420.

It is an arithmetic number, because the mean of its divisors is an integer number (315602460).

Almost surely, 2^1157209009 is an apocalyptic number.

It is an amenable number.

1157209009 is a deficient number, since it is larger than the sum of its proper divisors (105200831).

1157209009 is a wasteful number, since it uses less digits than its factorization.

1157209009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105200830.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 1157209009 is about 34017.7748978383. The cubic root of 1157209009 is about 1049.8742128984.

The spelling of 1157209009 in words is "one billion, one hundred fifty-seven million, two hundred nine thousand, nine".