897861919 has 4 divisors (see below), whose sum is σ = 950677344. Its totient is φ = 845046496.

The previous prime is 897861863. The next prime is 897861947. The reversal of 897861919 is 919168798.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919168798 = 2 ⋅459584399.

It is a cyclic number.

It is not a de Polignac number, because 897861919 - 2⁷ = 897861791 is a prime.

It is a super-2 number, since 2×897861919² = 1612312051180725122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897861119) 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, 26407687 + ... + 26407720.

It is an arithmetic number, because the mean of its divisors is an integer number (237669336).

Almost surely, 2^897861919 is an apocalyptic number.

897861919 is a deficient number, since it is larger than the sum of its proper divisors (52815425).

897861919 is a wasteful number, since it uses less digits than its factorization.

897861919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52815424.

The product of its digits is 1959552, while the sum is 58.

The square root of 897861919 is about 29964.3441276461. The cubic root of 897861919 is about 964.7242248474.

The spelling of 897861919 in words is "eight hundred ninety-seven million, eight hundred sixty-one thousand, nine hundred nineteen".