261343250 has 128 divisors (see below), whose sum is σ = 600956928. Its totient is φ = 83160000.

The previous prime is 261343241. The next prime is 261343253. The reversal of 261343250 is 52343162.

It is not an unprimeable number, because it can be changed into a prime (261343253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1730675 + ... + 1730825.

It is an arithmetic number, because the mean of its divisors is an integer number (4694976).

Almost surely, 2^261343250 is an apocalyptic number.

261343250 is an abundant number, since it is smaller than the sum of its proper divisors (339613678).

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

261343250 is a wasteful number, since it uses less digits than its factorization.

261343250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 261343250 is about 16166.1142517304. The cubic root of 261343250 is about 639.3476833373.

The spelling of 261343250 in words is "two hundred sixty-one million, three hundred forty-three thousand, two hundred fifty".