1151591 has 4 divisors (see below), whose sum is σ = 1316112. Its totient is φ = 987072.

The previous prime is 1151581. The next prime is 1151593. The reversal of 1151591 is 1951511.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1151591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151593) 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, 82250 + ... + 82263.

It is an arithmetic number, because the mean of its divisors is an integer number (329028).

2^1151591 is an apocalyptic number.

1151591 is a deficient number, since it is larger than the sum of its proper divisors (164521).

1151591 is an equidigital number, since it uses as much as digits as its factorization.

1151591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164520.

The product of its digits is 225, while the sum is 23.

The square root of 1151591 is about 1073.1220806600. The cubic root of 1151591 is about 104.8172482440.

The spelling of 1151591 in words is "one million, one hundred fifty-one thousand, five hundred ninety-one".