79533721 has 2 divisors, whose sum is σ = 79533722. Its totient is φ = 79533720.

The previous prime is 79533709. The next prime is 79533743. The reversal of 79533721 is 12733597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68244121 + 11289600 = 8261^2 + 3360^2 .

It is an emirp because it is prime and its reverse (12733597) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79533721 - 2¹⁷ = 79402649 is a prime.

It is a super-2 number, since 2×79533721² = 12651225552211682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79533521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39766860 + 39766861.

It is an arithmetic number, because the mean of its divisors is an integer number (39766861).

Almost surely, 2^79533721 is an apocalyptic number.

It is an amenable number.

79533721 is a deficient number, since it is larger than the sum of its proper divisors (1).

79533721 is an equidigital number, since it uses as much as digits as its factorization.

79533721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 37.

The square root of 79533721 is about 8918.1680293657. The cubic root of 79533721 is about 430.0481665893.

The spelling of 79533721 in words is "seventy-nine million, five hundred thirty-three thousand, seven hundred twenty-one".