231217977 has 4 divisors (see below), whose sum is σ = 308290640. Its totient is φ = 154145316.

The previous prime is 231217967. The next prime is 231217993. The reversal of 231217977 is 779712132.

231217977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 231217977 - 2⁶ = 231217913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231217927) 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, 38536327 + ... + 38536332.

It is an arithmetic number, because the mean of its divisors is an integer number (77072660).

Almost surely, 2^231217977 is an apocalyptic number.

It is an amenable number.

231217977 is a deficient number, since it is larger than the sum of its proper divisors (77072663).

231217977 is an equidigital number, since it uses as much as digits as its factorization.

231217977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77072662.

The product of its digits is 37044, while the sum is 39.

The square root of 231217977 is about 15205.8533795378. The cubic root of 231217977 is about 613.7721791989.

The spelling of 231217977 in words is "two hundred thirty-one million, two hundred seventeen thousand, nine hundred seventy-seven".