81210411 has 32 divisors (see below), whose sum is σ = 131803200. Its totient is φ = 49190400.

The previous prime is 81210391. The next prime is 81210413. The reversal of 81210411 is 11401218.

It is not a de Polignac number, because 81210411 - 2⁵ = 81210379 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81210413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10261 + ... + 16361.

It is an arithmetic number, because the mean of its divisors is an integer number (4118850).

Almost surely, 2^81210411 is an apocalyptic number.

81210411 is a deficient number, since it is larger than the sum of its proper divisors (50592789).

81210411 is a wasteful number, since it uses less digits than its factorization.

81210411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6156 (or 6150 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 81210411 is about 9011.6819184878. The cubic root of 81210411 is about 433.0491955191.

Adding to 81210411 its reverse (11401218), we get a palindrome (92611629).

The spelling of 81210411 in words is "eighty-one million, two hundred ten thousand, four hundred eleven".