261899201 has 4 divisors (see below), whose sum is σ = 263811012. Its totient is φ = 259987392.

The previous prime is 261899189. The next prime is 261899219. The reversal of 261899201 is 102998162.

261899201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108139201 + 153760000 = 10399^2 + 12400^2 .

It is a cyclic number.

It is not a de Polignac number, because 261899201 - 2¹⁰ = 261898177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261899221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955700 + ... + 955973.

It is an arithmetic number, because the mean of its divisors is an integer number (65952753).

Almost surely, 2^261899201 is an apocalyptic number.

It is an amenable number.

261899201 is a deficient number, since it is larger than the sum of its proper divisors (1911811).

261899201 is a wasteful number, since it uses less digits than its factorization.

261899201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911810.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 261899201 is about 16183.3000651907. The cubic root of 261899201 is about 639.8007200194.

The spelling of 261899201 in words is "two hundred sixty-one million, eight hundred ninety-nine thousand, two hundred one".