1151391 has 4 divisors (see below), whose sum is σ = 1535192. Its totient is φ = 767592.

The previous prime is 1151389. The next prime is 1151399. The reversal of 1151391 is 1931511.

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

It is not a de Polignac number, because 1151391 - 2¹ = 1151389 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191896 + ... + 191901.

It is an arithmetic number, because the mean of its divisors is an integer number (383798).

2^1151391 is an apocalyptic number.

1151391 is a deficient number, since it is larger than the sum of its proper divisors (383801).

1151391 is an equidigital number, since it uses as much as digits as its factorization.

1151391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383800.

The product of its digits is 135, while the sum is 21.

The square root of 1151391 is about 1073.0288905710. The cubic root of 1151391 is about 104.8111799253.

The spelling of 1151391 in words is "one million, one hundred fifty-one thousand, three hundred ninety-one".