231011649 has 16 divisors (see below), whose sum is σ = 373352640. Its totient is φ = 140006880.

The previous prime is 231011647. The next prime is 231011681. The reversal of 231011649 is 946110132.

231011649 is a `hidden beast` number, since 2 + 3 + 1 + 0 + 11 + 649 = 666.

231011649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231011649 - 2¹ = 231011647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (231011647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388612 + ... + 389205.

It is an arithmetic number, because the mean of its divisors is an integer number (23334540).

Almost surely, 2^231011649 is an apocalyptic number.

It is an amenable number.

231011649 is a deficient number, since it is larger than the sum of its proper divisors (142340991).

231011649 is a wasteful number, since it uses less digits than its factorization.

231011649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777837 (or 777831 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 231011649 is about 15199.0673727042. The cubic root of 231011649 is about 613.5895577677.

The spelling of 231011649 in words is "two hundred thirty-one million, eleven thousand, six hundred forty-nine".