897743661 has 4 divisors (see below), whose sum is σ = 1196991552. Its totient is φ = 598495772.

The previous prime is 897743629. The next prime is 897743669. The reversal of 897743661 is 166347798.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 897743661 - 2⁵ = 897743629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897743669) 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, 149623941 + ... + 149623946.

It is an arithmetic number, because the mean of its divisors is an integer number (299247888).

Almost surely, 2^897743661 is an apocalyptic number.

It is an amenable number.

897743661 is a deficient number, since it is larger than the sum of its proper divisors (299247891).

897743661 is a wasteful number, since it uses less digits than its factorization.

897743661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299247890.

The product of its digits is 1524096, while the sum is 51.

The square root of 897743661 is about 29962.3707506599. The cubic root of 897743661 is about 964.6818681613.

The spelling of 897743661 in words is "eight hundred ninety-seven million, seven hundred forty-three thousand, six hundred sixty-one".