81419441 has 8 divisors (see below), whose sum is σ = 82028904. Its totient is φ = 80812800.

The previous prime is 81419419. The next prime is 81419447. The reversal of 81419441 is 14491418.

It can be written as a sum of positive squares in 4 ways, for example, as 48011041 + 33408400 = 6929^2 + 5780^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81419441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81419398 and 81419407.

It is not an unprimeable number, because it can be changed into a prime (81419447) 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, 110711 + ... + 111443.

It is an arithmetic number, because the mean of its divisors is an integer number (10253613).

Almost surely, 2^81419441 is an apocalyptic number.

It is an amenable number.

81419441 is a deficient number, since it is larger than the sum of its proper divisors (609463).

81419441 is a wasteful number, since it uses less digits than its factorization.

81419441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411.

The product of its digits is 4608, while the sum is 32.

The square root of 81419441 is about 9023.2721891784. The cubic root of 81419441 is about 433.4204234556.

The spelling of 81419441 in words is "eighty-one million, four hundred nineteen thousand, four hundred forty-one".