231533340 has 24 divisors (see below), whose sum is σ = 648293520. Its totient is φ = 61742208.

The previous prime is 231533333. The next prime is 231533347. The reversal of 231533340 is 43335132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231533333) and next prime (231533347).

It is a self number, because there is not a number n which added to its sum of digits gives 231533340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231533347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1929385 + ... + 1929504.

It is an arithmetic number, because the mean of its divisors is an integer number (27012230).

Almost surely, 2^231533340 is an apocalyptic number.

231533340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231533340 is an abundant number, since it is smaller than the sum of its proper divisors (416760180).

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

231533340 is a wasteful number, since it uses less digits than its factorization.

231533340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3858901 (or 3858899 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 24.

The square root of 231533340 is about 15216.2196356388. The cubic root of 231533340 is about 614.0510979696.

Adding to 231533340 its reverse (43335132), we get a palindrome (274868472).

The spelling of 231533340 in words is "two hundred thirty-one million, five hundred thirty-three thousand, three hundred forty".