1151609 has 4 divisors (see below), whose sum is σ = 1212240. Its totient is φ = 1090980.

The previous prime is 1151603. The next prime is 1151611. The reversal of 1151609 is 9061511.

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: 9061511 = 379 ⋅23909.

It is not a de Polignac number, because 1151609 - 2⁴ = 1151593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1151603) 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, 30287 + ... + 30324.

It is an arithmetic number, because the mean of its divisors is an integer number (303060).

2^1151609 is an apocalyptic number.

1151609 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1151609 is a deficient number, since it is larger than the sum of its proper divisors (60631).

1151609 is an equidigital number, since it uses as much as digits as its factorization.

1151609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60630.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 1151609 is about 1073.1304673710. The cubic root of 1151609 is about 104.8177943582.

The spelling of 1151609 in words is "one million, one hundred fifty-one thousand, six hundred nine".