261198801 has 12 divisors (see below), whose sum is σ = 377491920. Its totient is φ = 174038040.

The previous prime is 261198797. The next prime is 261198851. The reversal of 261198801 is 108891162.

It is not a de Polignac number, because 261198801 - 2² = 261198797 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261198851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12370 + ... + 25988.

It is an arithmetic number, because the mean of its divisors is an integer number (31457660).

Almost surely, 2^261198801 is an apocalyptic number.

It is an amenable number.

261198801 is a deficient number, since it is larger than the sum of its proper divisors (116293119).

261198801 is a wasteful number, since it uses less digits than its factorization.

261198801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15756 (or 15753 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 261198801 is about 16161.6459867181. The cubic root of 261198801 is about 639.2298687342.

The spelling of 261198801 in words is "two hundred sixty-one million, one hundred ninety-eight thousand, eight hundred one".