261401193 has 6 divisors (see below), whose sum is σ = 377579514. Its totient is φ = 174267456.

The previous prime is 261401191. The next prime is 261401201. The reversal of 261401193 is 391104162.

It can be written as a sum of positive squares in only one way, i.e., 260887104 + 514089 = 16152^2 + 717^2 .

It is not a de Polignac number, because 261401193 - 2¹ = 261401191 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261401191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14522280 + ... + 14522297.

It is an arithmetic number, because the mean of its divisors is an integer number (62929919).

Almost surely, 2^261401193 is an apocalyptic number.

It is an amenable number.

261401193 is a deficient number, since it is larger than the sum of its proper divisors (116178321).

261401193 is a wasteful number, since it uses less digits than its factorization.

261401193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29044583 (or 29044580 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 261401193 is about 16167.9062651909. The cubic root of 261401193 is about 639.3949302502.

The spelling of 261401193 in words is "two hundred sixty-one million, four hundred one thousand, one hundred ninety-three".