261901206 has 96 divisors (see below), whose sum is σ = 704870400. Its totient is φ = 68584320.

The previous prime is 261901183. The next prime is 261901217. The reversal of 261901206 is 602109162.

It is a self number, because there is not a number n which added to its sum of digits gives 261901206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72450 + ... + 75978.

It is an arithmetic number, because the mean of its divisors is an integer number (7342400).

Almost surely, 2^261901206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261901206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352435200).

261901206 is an abundant number, since it is smaller than the sum of its proper divisors (442969194).

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

261901206 is a wasteful number, since it uses less digits than its factorization.

261901206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3594 (or 3591 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 261901206 is about 16183.3620116464. The cubic root of 261901206 is about 639.8023527051.

The spelling of 261901206 in words is "two hundred sixty-one million, nine hundred one thousand, two hundred six".