1151881 has 2 divisors, whose sum is σ = 1151882. Its totient is φ = 1151880.

The previous prime is 1151879. The next prime is 1151911. The reversal of 1151881 is 1881511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1071225 + 80656 = 1035^2 + 284^2 .

It is an emirp because it is prime and its reverse (1881511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1151881 - 2¹ = 1151879 is a prime.

It is a super-2 number, since 2×1151881² = 2653659676322, which contains 22 as substring.

Together with 1151879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1151861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575940 + 575941.

It is an arithmetic number, because the mean of its divisors is an integer number (575941).

2^1151881 is an apocalyptic number.

It is an amenable number.

1151881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151881 is an equidigital number, since it uses as much as digits as its factorization.

1151881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 25.

The square root of 1151881 is about 1073.2571919163. The cubic root of 1151881 is about 104.8260460581.

The spelling of 1151881 in words is "one million, one hundred fifty-one thousand, eight hundred eighty-one".