997787801 has 2 divisors, whose sum is σ = 997787802. Its totient is φ = 997787800.

The previous prime is 997787773. The next prime is 997787821. The reversal of 997787801 is 108787799.

997787801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 997296400 + 491401 = 31580^2 + 701^2 .

It is a cyclic number.

It is not a de Polignac number, because 997787801 - 2¹⁴ = 997771417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997787821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498893900 + 498893901.

It is an arithmetic number, because the mean of its divisors is an integer number (498893901).

Almost surely, 2^997787801 is an apocalyptic number.

It is an amenable number.

997787801 is a deficient number, since it is larger than the sum of its proper divisors (1).

997787801 is an equidigital number, since it uses as much as digits as its factorization.

997787801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 56.

The square root of 997787801 is about 31587.7792983299. The cubic root of 997787801 is about 999.2620559058.

The spelling of 997787801 in words is "nine hundred ninety-seven million, seven hundred eighty-seven thousand, eight hundred one".