1151971 has 4 divisors (see below), whose sum is σ = 1219752. Its totient is φ = 1084192.

The previous prime is 1151963. The next prime is 1151981. The reversal of 1151971 is 1791511.

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

It is not a de Polignac number, because 1151971 - 2³ = 1151963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151911) 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, 33865 + ... + 33898.

It is an arithmetic number, because the mean of its divisors is an integer number (304938).

2^1151971 is an apocalyptic number.

1151971 is a deficient number, since it is larger than the sum of its proper divisors (67781).

1151971 is an equidigital number, since it uses as much as digits as its factorization.

1151971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67780.

The product of its digits is 315, while the sum is 25.

The square root of 1151971 is about 1073.2991195375. The cubic root of 1151971 is about 104.8287761140.

The spelling of 1151971 in words is "one million, one hundred fifty-one thousand, nine hundred seventy-one".