1141981 has 8 divisors (see below), whose sum is σ = 1178744. Its totient is φ = 1105920.

The previous prime is 1141969. The next prime is 1141999. The reversal of 1141981 is 1891411.

It can be written as a sum of positive squares in 4 ways, for example, as 5625 + 1136356 = 75^2 + 1066^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 7-Lehmer number, since φ(1141981) divides (1141981-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 1141981 - 2⁵ = 1141949 is a prime.

It is a super-2 number, since 2×1141981² = 2608241208722, which contains 22 as substring.

1141981 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1141901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5821 + ... + 6013.

It is an arithmetic number, because the mean of its divisors is an integer number (147343).

2^1141981 is an apocalyptic number.

It is an amenable number.

1141981 is a deficient number, since it is larger than the sum of its proper divisors (36763).

1141981 is an equidigital number, since it uses as much as digits as its factorization.

1141981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351.

The product of its digits is 288, while the sum is 25.

The square root of 1141981 is about 1068.6351107838. The cubic root of 1141981 is about 104.5248675967.

The spelling of 1141981 in words is "one million, one hundred forty-one thousand, nine hundred eighty-one".