261271098 has 48 divisors (see below), whose sum is σ = 620377056. Its totient is φ = 78810720.

The previous prime is 261271067. The next prime is 261271103. The reversal of 261271098 is 890172162.

261271098 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42040 + ... + 47852.

It is an arithmetic number, because the mean of its divisors is an integer number (12924522).

Almost surely, 2^261271098 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261271098, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310188528).

261271098 is an abundant number, since it is smaller than the sum of its proper divisors (359105958).

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

261271098 is a wasteful number, since it uses less digits than its factorization.

261271098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6059 (or 6056 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 261271098 is about 16163.8825162768. The cubic root of 261271098 is about 639.2888405958.

It can be divided in two parts, 26127 and 1098, that added together give a square (27225 = 165²).

The spelling of 261271098 in words is "two hundred sixty-one million, two hundred seventy-one thousand, ninety-eight".