997533801 has 72 divisors (see below), whose sum is σ = 1713508160. Its totient is φ = 556839360.

The previous prime is 997533799. The next prime is 997533809. The reversal of 997533801 is 108335799.

It is a happy number.

It is not a de Polignac number, because 997533801 - 2¹ = 997533799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997533809) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 764916 + ... + 766218.

Almost surely, 2^997533801 is an apocalyptic number.

It is an amenable number.

997533801 is a deficient number, since it is larger than the sum of its proper divisors (715974359).

997533801 is a wasteful number, since it uses less digits than its factorization.

997533801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387 (or 1373 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 997533801 is about 31583.7585002165. The cubic root of 997533801 is about 999.1772569462.

The spelling of 997533801 in words is "nine hundred ninety-seven million, five hundred thirty-three thousand, eight hundred one".