261249402 has 32 divisors (see below), whose sum is σ = 533537280. Its totient is φ = 85250880.

The previous prime is 261249379. The next prime is 261249403. The reversal of 261249402 is 204942162.

261249402 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 261249402.

It is not an unprimeable number, because it can be changed into a prime (261249403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263127 + ... + 264117.

It is an arithmetic number, because the mean of its divisors is an integer number (16673040).

Almost surely, 2^261249402 is an apocalyptic number.

261249402 is an abundant number, since it is smaller than the sum of its proper divisors (272287878).

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

261249402 is a wasteful number, since it uses less digits than its factorization.

261249402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 261249402 is about 16163.2113764561. The cubic root of 261249402 is about 639.2711445517.

The spelling of 261249402 in words is "two hundred sixty-one million, two hundred forty-nine thousand, four hundred two".