261231304 has 32 divisors (see below), whose sum is σ = 533376000. Its totient is φ = 119472192.

The previous prime is 261231283. The next prime is 261231307. The reversal of 261231304 is 403132162.

It is not an unprimeable number, because it can be changed into a prime (261231307) 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, 25224 + ... + 34039.

It is an arithmetic number, because the mean of its divisors is an integer number (16668000).

Almost surely, 2^261231304 is an apocalyptic number.

It is an amenable number.

261231304 is an abundant number, since it is smaller than the sum of its proper divisors (272144696).

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

261231304 is a wasteful number, since it uses less digits than its factorization.

261231304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59317 (or 59313 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 261231304 is about 16162.6515151444. The cubic root of 261231304 is about 639.2563824173.

Adding to 261231304 its reverse (403132162), we get a palindrome (664363466).

The spelling of 261231304 in words is "two hundred sixty-one million, two hundred thirty-one thousand, three hundred four".