261944898 has 8 divisors (see below), whose sum is σ = 523889808. Its totient is φ = 87314964.

The previous prime is 261944869. The next prime is 261944939. The reversal of 261944898 is 898449162.

It is a sphenic number, since it is the product of 3 distinct primes.

261944898 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 261944898.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21828736 + ... + 21828747.

It is an arithmetic number, because the mean of its divisors is an integer number (65486226).

Almost surely, 2^261944898 is an apocalyptic number.

261944898 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

261944898 is a wasteful number, since it uses less digits than its factorization.

261944898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43657488.

The product of its digits is 995328, while the sum is 51.

The square root of 261944898 is about 16184.7118602711. The cubic root of 261944898 is about 639.8379293390.

The spelling of 261944898 in words is "two hundred sixty-one million, nine hundred forty-four thousand, eight hundred ninety-eight".