79921533 has 4 divisors (see below), whose sum is σ = 106562048. Its totient is φ = 53281020.

The previous prime is 79921507. The next prime is 79921559. The reversal of 79921533 is 33512997.

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 an interprime number because it is at equal distance from previous prime (79921507) and next prime (79921559).

It is not a de Polignac number, because 79921533 - 2¹⁰ = 79920509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79921491 and 79921500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79921033) 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, 13320253 + ... + 13320258.

It is an arithmetic number, because the mean of its divisors is an integer number (26640512).

Almost surely, 2^79921533 is an apocalyptic number.

It is an amenable number.

79921533 is a deficient number, since it is larger than the sum of its proper divisors (26640515).

79921533 is a wasteful number, since it uses less digits than its factorization.

79921533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26640514.

The product of its digits is 51030, while the sum is 39.

The square root of 79921533 is about 8939.8843952257. The cubic root of 79921533 is about 430.7460152332.

The spelling of 79921533 in words is "seventy-nine million, nine hundred twenty-one thousand, five hundred thirty-three".