81143411 has 2 divisors, whose sum is σ = 81143412. Its totient is φ = 81143410.

The previous prime is 81143407. The next prime is 81143437. The reversal of 81143411 is 11434118.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81143411 - 2² = 81143407 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81143311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40571705 + 40571706.

It is an arithmetic number, because the mean of its divisors is an integer number (40571706).

Almost surely, 2^81143411 is an apocalyptic number.

81143411 is a deficient number, since it is larger than the sum of its proper divisors (1).

81143411 is an equidigital number, since it uses as much as digits as its factorization.

81143411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 23.

The square root of 81143411 is about 9007.9637543676. The cubic root of 81143411 is about 432.9300717167.

Adding to 81143411 its reverse (11434118), we get a palindrome (92577529).

The spelling of 81143411 in words is "eighty-one million, one hundred forty-three thousand, four hundred eleven".