81469441 has 2 divisors, whose sum is σ = 81469442. Its totient is φ = 81469440.

The previous prime is 81469433. The next prime is 81469459. The reversal of 81469441 is 14496418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79727041 + 1742400 = 8929^2 + 1320^2 .

It is a cyclic number.

It is not a de Polignac number, because 81469441 - 2³ = 81469433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81469441.

It is not a weakly prime, because it can be changed into another prime (81469411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40734720 + 40734721.

It is an arithmetic number, because the mean of its divisors is an integer number (40734721).

Almost surely, 2^81469441 is an apocalyptic number.

It is an amenable number.

81469441 is a deficient number, since it is larger than the sum of its proper divisors (1).

81469441 is an equidigital number, since it uses as much as digits as its factorization.

81469441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 81469441 is about 9026.0423774764. The cubic root of 81469441 is about 433.5091270311.

The spelling of 81469441 in words is "eighty-one million, four hundred sixty-nine thousand, four hundred forty-one".