231897816 has 112 divisors (see below), whose sum is σ = 690557400. Its totient is φ = 72721152.

The previous prime is 231897781. The next prime is 231897817. The reversal of 231897816 is 618798132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231897817) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 97975 + ... + 100313.

Almost surely, 2^231897816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231897816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345278700).

231897816 is an abundant number, since it is smaller than the sum of its proper divisors (458659584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231897816 is a wasteful number, since it uses less digits than its factorization.

231897816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2380 (or 2361 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 231897816 is about 15228.1914881577. The cubic root of 231897816 is about 614.3731387793.

The spelling of 231897816 in words is "two hundred thirty-one million, eight hundred ninety-seven thousand, eight hundred sixteen".