261471546 has 144 divisors (see below), whose sum is σ = 694856448. Its totient is φ = 70761600.

The previous prime is 261471541. The next prime is 261471571. The reversal of 261471546 is 645174162.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261471546.

It is not an unprimeable number, because it can be changed into a prime (261471541) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1995901 + ... + 1996031.

It is an arithmetic number, because the mean of its divisors is an integer number (4825392).

Almost surely, 2^261471546 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261471546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347428224).

261471546 is an abundant number, since it is smaller than the sum of its proper divisors (433384902).

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

261471546 is a wasteful number, since it uses less digits than its factorization.

261471546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 247 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 261471546 is about 16170.0818179748. The cubic root of 261471546 is about 639.4522869338.

The spelling of 261471546 in words is "two hundred sixty-one million, four hundred seventy-one thousand, five hundred forty-six".