231741640 has 32 divisors (see below), whose sum is σ = 561529080. Its totient is φ = 85565952.

The previous prime is 231741589. The next prime is 231741649. The reversal of 231741640 is 46147132.

It can be written as a sum of positive squares in 4 ways, for example, as 201469636 + 30272004 = 14194^2 + 5502^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231741599 and 231741608.

It is not an unprimeable number, because it can be changed into a prime (231741649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222309 + ... + 223348.

Almost surely, 2^231741640 is an apocalyptic number.

231741640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231741640 is an abundant number, since it is smaller than the sum of its proper divisors (329787440).

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

231741640 is a wasteful number, since it uses less digits than its factorization.

231741640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445681 (or 445677 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 231741640 is about 15223.0627667365. The cubic root of 231741640 is about 614.2351873762.

Adding to 231741640 its reverse (46147132), we get a palindrome (277888772).

The spelling of 231741640 in words is "two hundred thirty-one million, seven hundred forty-one thousand, six hundred forty".