81062641 has 4 divisors (see below), whose sum is σ = 88431984. Its totient is φ = 73693300.

The previous prime is 81062633. The next prime is 81062651. The reversal of 81062641 is 14626018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81062641 - 2³ = 81062633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81062621) 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, 3684655 + ... + 3684676.

It is an arithmetic number, because the mean of its divisors is an integer number (22107996).

Almost surely, 2^81062641 is an apocalyptic number.

It is an amenable number.

81062641 is a deficient number, since it is larger than the sum of its proper divisors (7369343).

81062641 is a wasteful number, since it uses less digits than its factorization.

81062641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7369342.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 81062641 is about 9003.4793829941. The cubic root of 81062641 is about 432.7863781000.

Adding to 81062641 its reverse (14626018), we get a palindrome (95688659).

The spelling of 81062641 in words is "eighty-one million, sixty-two thousand, six hundred forty-one".