79781413 has 4 divisors (see below), whose sum is σ = 80355520. Its totient is φ = 79207308.

The previous prime is 79781381. The next prime is 79781417. The reversal of 79781413 is 31418797.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31418797 = 967 ⋅32491.

It is a cyclic number.

It is not a de Polignac number, because 79781413 - 2⁵ = 79781381 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 (79781417) 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, 286845 + ... + 287122.

It is an arithmetic number, because the mean of its divisors is an integer number (20088880).

Almost surely, 2^79781413 is an apocalyptic number.

It is an amenable number.

79781413 is a deficient number, since it is larger than the sum of its proper divisors (574107).

79781413 is a wasteful number, since it uses less digits than its factorization.

79781413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574106.

The product of its digits is 42336, while the sum is 40.

The square root of 79781413 is about 8932.0441669307. The cubic root of 79781413 is about 430.4941371877.

The spelling of 79781413 in words is "seventy-nine million, seven hundred eighty-one thousand, four hundred thirteen".