997799212201 has 27 divisors (see below), whose sum is σ = 1113289756509. Its totient is φ = 893615045400.

The previous prime is 997799212183. The next prime is 997799212211. The reversal of 997799212201 is 102212997799.

The square root of 997799212201 is 998899.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 997799212201 - 2¹⁹ = 997798687913 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997799212211) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 780139480 + ... + 780140758.

Almost surely, 2^997799212201 is an apocalyptic number.

997799212201 is the 998899-th square number.

997799212201 is the 499450-th centered octagonal number.

It is an amenable number.

997799212201 is a deficient number, since it is larger than the sum of its proper divisors (115490544308).

997799212201 is an frugal number, since it uses more digits than its factorization.

997799212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722 (or 1361 counting only the distinct ones).

The product of its (nonzero) digits is 2571912, while the sum is 58.

It can be divided in two parts, 997799 and 212201, that added together give a square (1210000 = 1100²).

The spelling of 997799212201 in words is "nine hundred ninety-seven billion, seven hundred ninety-nine million, two hundred twelve thousand, two hundred one".