979405621 has 2 divisors, whose sum is σ = 979405622. Its totient is φ = 979405620.

The previous prime is 979405613. The next prime is 979405627. The reversal of 979405621 is 126504979.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 637562500 + 341843121 = 25250^2 + 18489^2 .

It is an emirp because it is prime and its reverse (126504979) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 979405621 - 2³ = 979405613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (979405627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489702810 + 489702811.

It is an arithmetic number, because the mean of its divisors is an integer number (489702811).

Almost surely, 2^979405621 is an apocalyptic number.

It is an amenable number.

979405621 is a deficient number, since it is larger than the sum of its proper divisors (1).

979405621 is an equidigital number, since it uses as much as digits as its factorization.

979405621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 979405621 is about 31295.4568747606. The cubic root of 979405621 is about 993.0875349241.

The spelling of 979405621 in words is "nine hundred seventy-nine million, four hundred five thousand, six hundred twenty-one".