79621 has 2 divisors, whose sum is σ = 79622. Its totient is φ = 79620.

The previous prime is 79613. The next prime is 79627. The reversal of 79621 is 12697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57121 + 22500 = 239^2 + 150^2 .

It is an emirp because it is prime and its reverse (12697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79621 - 2³ = 79613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39810 + 39811.

It is an arithmetic number, because the mean of its divisors is an integer number (39811).

2⁷⁹⁶²¹ is an apocalyptic number.

It is an amenable number.

79621 is a deficient number, since it is larger than the sum of its proper divisors (1).

79621 is an equidigital number, since it uses as much as digits as its factorization.

79621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 25.

The square root of 79621 is about 282.1719334023. The cubic root of 79621 is about 43.0205418348.

The spelling of 79621 in words is "seventy-nine thousand, six hundred twenty-one".