231716649 has 4 divisors (see below), whose sum is σ = 308955536. Its totient is φ = 154477764.

The previous prime is 231716633. The next prime is 231716657. The reversal of 231716649 is 946617132.

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 231716649 - 2⁴ = 231716633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231716249) 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, 38619439 + ... + 38619444.

It is an arithmetic number, because the mean of its divisors is an integer number (77238884).

Almost surely, 2^231716649 is an apocalyptic number.

It is an amenable number.

231716649 is a deficient number, since it is larger than the sum of its proper divisors (77238887).

231716649 is an equidigital number, since it uses as much as digits as its factorization.

231716649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77238886.

The product of its digits is 54432, while the sum is 39.

The square root of 231716649 is about 15222.2419176677. The cubic root of 231716649 is about 614.2131068913.

The spelling of 231716649 in words is "two hundred thirty-one million, seven hundred sixteen thousand, six hundred forty-nine".