261322548 has 24 divisors (see below), whose sum is σ = 612376128. Its totient is φ = 86732736.

The previous prime is 261322543. The next prime is 261322549. The reversal of 261322548 is 845223162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261322541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43936 + ... + 49527.

It is an arithmetic number, because the mean of its divisors is an integer number (25515672).

Almost surely, 2^261322548 is an apocalyptic number.

It is an amenable number.

261322548 is an abundant number, since it is smaller than the sum of its proper divisors (351053580).

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

261322548 is a wasteful number, since it uses less digits than its factorization.

261322548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93703 (or 93701 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 261322548 is about 16165.4739491300. The cubic root of 261322548 is about 639.3308011651.

It can be divided in two parts, 26132 and 2548, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 261322548 in words is "two hundred sixty-one million, three hundred twenty-two thousand, five hundred forty-eight".