997627979 has 2 divisors, whose sum is σ = 997627980. Its totient is φ = 997627978.

The previous prime is 997627973. The next prime is 997628069. The reversal of 997627979 is 979726799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997627979 - 2⁴ = 997627963 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997627973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498813989 + 498813990.

It is an arithmetic number, because the mean of its divisors is an integer number (498813990).

Almost surely, 2^997627979 is an apocalyptic number.

997627979 is a deficient number, since it is larger than the sum of its proper divisors (1).

997627979 is an equidigital number, since it uses as much as digits as its factorization.

997627979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27005076, while the sum is 65.

The square root of 997627979 is about 31585.2493895489. The cubic root of 997627979 is about 999.2087003433.

The spelling of 997627979 in words is "nine hundred ninety-seven million, six hundred twenty-seven thousand, nine hundred seventy-nine".