897209249 has 4 divisors (see below), whose sum is σ = 897612564. Its totient is φ = 896805936.

The previous prime is 897209239. The next prime is 897209251. The reversal of 897209249 is 942902798.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 942902798 = 2 ⋅471451399.

It can be written as a sum of positive squares in 2 ways, for example, as 808378624 + 88830625 = 28432^2 + 9425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-897209249 is a prime.

It is a super-2 number, since 2×897209249² = 1609968872982288002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 897209197 and 897209206.

It is not an unprimeable number, because it can be changed into a prime (897209219) 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, 198302 + ... + 202775.

It is an arithmetic number, because the mean of its divisors is an integer number (224403141).

Almost surely, 2^897209249 is an apocalyptic number.

It is an amenable number.

897209249 is a deficient number, since it is larger than the sum of its proper divisors (403315).

897209249 is a wasteful number, since it uses less digits than its factorization.

897209249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403314.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 897209249 is about 29953.4513704181. The cubic root of 897209249 is about 964.4904104287.

The spelling of 897209249 in words is "eight hundred ninety-seven million, two hundred nine thousand, two hundred forty-nine".