81214741 has 4 divisors (see below), whose sum is σ = 83409772. Its totient is φ = 79019712.

The previous prime is 81214733. The next prime is 81214751. The reversal of 81214741 is 14741218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14741218 = 2 ⋅7370609.

It can be written as a sum of positive squares in 2 ways, for example, as 28579716 + 52635025 = 5346^2 + 7255^2 .

It is a cyclic number.

It is not a de Polignac number, because 81214741 - 2³ = 81214733 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81214711) 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, 1097460 + ... + 1097533.

It is an arithmetic number, because the mean of its divisors is an integer number (20852443).

Almost surely, 2^81214741 is an apocalyptic number.

It is an amenable number.

81214741 is a deficient number, since it is larger than the sum of its proper divisors (2195031).

81214741 is a wasteful number, since it uses less digits than its factorization.

81214741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195030.

The product of its digits is 1792, while the sum is 28.

The square root of 81214741 is about 9011.9221590069. The cubic root of 81214741 is about 433.0568918627.

Adding to 81214741 its reverse (14741218), we get a palindrome (95955959).

The spelling of 81214741 in words is "eighty-one million, two hundred fourteen thousand, seven hundred forty-one".