997670801 has 2 divisors, whose sum is σ = 997670802. Its totient is φ = 997670800.

The previous prime is 997670777. The next prime is 997670809. The reversal of 997670801 is 108076799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 913490176 + 84180625 = 30224^2 + 9175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997670801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997670809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498835400 + 498835401.

It is an arithmetic number, because the mean of its divisors is an integer number (498835401).

Almost surely, 2^997670801 is an apocalyptic number.

It is an amenable number.

997670801 is a deficient number, since it is larger than the sum of its proper divisors (1).

997670801 is an equidigital number, since it uses as much as digits as its factorization.

997670801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 997670801 is about 31585.9272619944. The cubic root of 997670801 is about 999.2229967557. Note that the first 3 decimals are identical.

The spelling of 997670801 in words is "nine hundred ninety-seven million, six hundred seventy thousand, eight hundred one".