979820251 has 2 divisors, whose sum is σ = 979820252. Its totient is φ = 979820250.

The previous prime is 979820243. The next prime is 979820267. The reversal of 979820251 is 152028979.

It is a weak prime.

It is an emirp because it is prime and its reverse (152028979) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 979820251 - 2³ = 979820243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 979820198 and 979820207.

It is not a weakly prime, because it can be changed into another prime (979820351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489910125 + 489910126.

It is an arithmetic number, because the mean of its divisors is an integer number (489910126).

Almost surely, 2^979820251 is an apocalyptic number.

979820251 is a deficient number, since it is larger than the sum of its proper divisors (1).

979820251 is an equidigital number, since it uses as much as digits as its factorization.

979820251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 979820251 is about 31302.0806177481. The cubic root of 979820251 is about 993.2276558923.

The spelling of 979820251 in words is "nine hundred seventy-nine million, eight hundred twenty thousand, two hundred fifty-one".