81246613 has 8 divisors (see below), whose sum is σ = 93198080. Its totient is φ = 69381360.

The previous prime is 81246611. The next prime is 81246619. The reversal of 81246613 is 31664218.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81246613 - 2¹ = 81246611 is a prime.

It is a super-3 number, since 3×81246613³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81246611) 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, 19518 + ... + 23311.

It is an arithmetic number, because the mean of its divisors is an integer number (11649760).

Almost surely, 2^81246613 is an apocalyptic number.

It is an amenable number.

81246613 is a deficient number, since it is larger than the sum of its proper divisors (11951467).

81246613 is a wasteful number, since it uses less digits than its factorization.

81246613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43107.

The product of its digits is 6912, while the sum is 31.

The square root of 81246613 is about 9013.6903097455. The cubic root of 81246613 is about 433.1135342241.

The spelling of 81246613 in words is "eighty-one million, two hundred forty-six thousand, six hundred thirteen".