993420251 has 2 divisors, whose sum is σ = 993420252. Its totient is φ = 993420250.

The previous prime is 993420227. The next prime is 993420299. The reversal of 993420251 is 152024399.

It is a weak prime.

It is an emirp because it is prime and its reverse (152024399) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 993420251 - 2²² = 989225947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (993420221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496710125 + 496710126.

It is an arithmetic number, because the mean of its divisors is an integer number (496710126).

Almost surely, 2^993420251 is an apocalyptic number.

993420251 is a deficient number, since it is larger than the sum of its proper divisors (1).

993420251 is an equidigital number, since it uses as much as digits as its factorization.

993420251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 993420251 is about 31518.5699390058. The cubic root of 993420251 is about 997.8019223279.

The spelling of 993420251 in words is "nine hundred ninety-three million, four hundred twenty thousand, two hundred fifty-one".