81011941 has 4 divisors (see below), whose sum is σ = 82987884. Its totient is φ = 79036000.

The previous prime is 81011939. The next prime is 81011951. The reversal of 81011941 is 14911018.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27867841 + 53144100 = 5279^2 + 7290^2 .

It is a cyclic number.

It is not a de Polignac number, because 81011941 - 2¹ = 81011939 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81011951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 987910 + ... + 987991.

It is an arithmetic number, because the mean of its divisors is an integer number (20746971).

Almost surely, 2^81011941 is an apocalyptic number.

It is an amenable number.

81011941 is a deficient number, since it is larger than the sum of its proper divisors (1975943).

81011941 is a wasteful number, since it uses less digits than its factorization.

81011941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975942.

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

The square root of 81011941 is about 9000.6633644415. The cubic root of 81011941 is about 432.6961316551.

Adding to 81011941 its reverse (14911018), we get a palindrome (95922959).

The spelling of 81011941 in words is "eighty-one million, eleven thousand, nine hundred forty-one".