79889531 has 4 divisors (see below), whose sum is σ = 80596632. Its totient is φ = 79182432.

The previous prime is 79889507. The next prime is 79889539. The reversal of 79889531 is 13598897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13598897 = 13 ⋅1046069.

It is a cyclic number.

It is not a de Polignac number, because 79889531 - 2¹⁴ = 79873147 is a prime.

It is a super-2 number, since 2×79889531² = 12764674326799922, which contains 22 as substring.

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 79889531.

It is not an unprimeable number, because it can be changed into a prime (79889539) 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, 353381 + ... + 353606.

It is an arithmetic number, because the mean of its divisors is an integer number (20149158).

Almost surely, 2^79889531 is an apocalyptic number.

79889531 is a deficient number, since it is larger than the sum of its proper divisors (707101).

79889531 is a wasteful number, since it uses less digits than its factorization.

79889531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707100.

The product of its digits is 544320, while the sum is 50.

The square root of 79889531 is about 8938.0943718446. The cubic root of 79889531 is about 430.6885147751.

The spelling of 79889531 in words is "seventy-nine million, eight hundred eighty-nine thousand, five hundred thirty-one".