1152661909 has 4 divisors (see below), whose sum is σ = 1317327904. Its totient is φ = 987995916.

The previous prime is 1152661907. The next prime is 1152661949. The reversal of 1152661909 is 9091662511.

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: 9091662511 = 1301 ⋅6988211.

It is a cyclic number.

It is not a de Polignac number, because 1152661909 - 2¹ = 1152661907 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 (1152661907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82332987 + ... + 82333000.

It is an arithmetic number, because the mean of its divisors is an integer number (329331976).

Almost surely, 2^1152661909 is an apocalyptic number.

It is an amenable number.

1152661909 is a deficient number, since it is larger than the sum of its proper divisors (164665995).

1152661909 is an equidigital number, since it uses as much as digits as its factorization.

1152661909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164665994.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 1152661909 is about 33950.8749371795. The cubic root of 1152661909 is about 1048.4972938161.

The spelling of 1152661909 in words is "one billion, one hundred fifty-two million, six hundred sixty-one thousand, nine hundred nine".