81424061 has 4 divisors (see below), whose sum is σ = 81461952. Its totient is φ = 81386172.

The previous prime is 81424051. The next prime is 81424097. The reversal of 81424061 is 16042418.

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 81424061 - 2⁶ = 81423997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81424061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81424001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15515 + ... + 20088.

It is an arithmetic number, because the mean of its divisors is an integer number (20365488).

Almost surely, 2^81424061 is an apocalyptic number.

It is an amenable number.

81424061 is a deficient number, since it is larger than the sum of its proper divisors (37891).

81424061 is a wasteful number, since it uses less digits than its factorization.

81424061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37890.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 81424061 is about 9023.5281902369. The cubic root of 81424061 is about 433.4286211885.

Adding to 81424061 its reverse (16042418), we get a palindrome (97466479).

The spelling of 81424061 in words is "eighty-one million, four hundred twenty-four thousand, sixty-one".