81207413 has 4 divisors (see below), whose sum is σ = 92808480. Its totient is φ = 69606348.

The previous prime is 81207407. The next prime is 81207431. The reversal of 81207413 is 31470218.

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 not a de Polignac number, because 81207413 - 2⁴ = 81207397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81207403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5800523 + ... + 5800536.

It is an arithmetic number, because the mean of its divisors is an integer number (23202120).

Almost surely, 2^81207413 is an apocalyptic number.

It is an amenable number.

81207413 is a deficient number, since it is larger than the sum of its proper divisors (11601067).

81207413 is a wasteful number, since it uses less digits than its factorization.

81207413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11601066.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 81207413 is about 9011.5155773044. The cubic root of 81207413 is about 433.0438665740.

The spelling of 81207413 in words is "eighty-one million, two hundred seven thousand, four hundred thirteen".