997444135201 has 4 divisors (see below), whose sum is σ = 997446632004. Its totient is φ = 997441638400.

The previous prime is 997444135189. The next prime is 997444135211. The reversal of 997444135201 is 102531444799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102531444799 = 7 ⋅14647349257.

It can be written as a sum of positive squares in 2 ways, for example, as 245366669025 + 752077466176 = 495345^2 + 867224^2 .

It is a 3-Lehmer number, since φ(997444135201) divides (997444135201-1)³.

It is a cyclic number.

It is not a de Polignac number, because 997444135201 - 2⁷ = 997444135073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997444135211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499360 + ... + 1498081.

It is an arithmetic number, because the mean of its divisors is an integer number (249361658001).

It is a Poulet number, since it divides 2^997444135200-1.

Almost surely, 2^997444135201 is an apocalyptic number.

997444135201 is the 499361-st decagonal number.

It is an amenable number.

997444135201 is a deficient number, since it is larger than the sum of its proper divisors (2496803).

997444135201 is a wasteful number, since it uses less digits than its factorization.

997444135201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496802.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 997444135201 in words is "nine hundred ninety-seven billion, four hundred forty-four million, one hundred thirty-five thousand, two hundred one".