261030252 has 72 divisors (see below), whose sum is σ = 710673264. Its totient is φ = 74352768.

The previous prime is 261030229. The next prime is 261030277. The reversal of 261030252 is 252030162.

261030252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 327118 + ... + 327914.

It is an arithmetic number, because the mean of its divisors is an integer number (9870462).

Almost surely, 2^261030252 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261030252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (355336632).

261030252 is an abundant number, since it is smaller than the sum of its proper divisors (449643012).

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

261030252 is a wasteful number, since it uses less digits than its factorization.

261030252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 261030252 is about 16156.4306701697. The cubic root of 261030252 is about 639.0923429137.

The spelling of 261030252 in words is "two hundred sixty-one million, thirty thousand, two hundred fifty-two".