231261649 has 4 divisors (see below), whose sum is σ = 232435764. Its totient is φ = 230087536.

The previous prime is 231261637. The next prime is 231261733. The reversal of 231261649 is 946162132.

It is a happy number.

231261649 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.

It can be written as a sum of positive squares in 2 ways, for example, as 210395025 + 20866624 = 14505^2 + 4568^2 .

It is a cyclic number.

It is not a de Polignac number, because 231261649 - 2¹³ = 231253457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231261449) 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, 586762 + ... + 587155.

It is an arithmetic number, because the mean of its divisors is an integer number (58108941).

Almost surely, 2^231261649 is an apocalyptic number.

It is an amenable number.

231261649 is a deficient number, since it is larger than the sum of its proper divisors (1174115).

231261649 is a wasteful number, since it uses less digits than its factorization.

231261649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174114.

The product of its digits is 15552, while the sum is 34.

The square root of 231261649 is about 15207.2893376828. The cubic root of 231261649 is about 613.8108194631.

The spelling of 231261649 in words is "two hundred thirty-one million, two hundred sixty-one thousand, six hundred forty-nine".