997288424287 has 4 divisors (see below), whose sum is σ = 997290462760. Its totient is φ = 997286385816.

The previous prime is 997288424267. The next prime is 997288424311. The reversal of 997288424287 is 782424882799.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a 3-Lehmer number, since φ(997288424287) divides (997288424287-1)³.

It is a cyclic number.

It is not a de Polignac number, because 997288424287 - 2¹¹ = 997288422239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997288424267) 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, 203848 + ... + 1426930.

It is an arithmetic number, because the mean of its divisors is an integer number (249322615690).

Almost surely, 2^997288424287 is an apocalyptic number.

997288424287 is the 815389-th pentagonal number.

997288424287 is a deficient number, since it is larger than the sum of its proper divisors (2038473).

997288424287 is a wasteful number, since it uses less digits than its factorization.

997288424287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038472.

The product of its digits is 260112384, while the sum is 70.

The spelling of 997288424287 in words is "nine hundred ninety-seven billion, two hundred eighty-eight million, four hundred twenty-four thousand, two hundred eighty-seven".