261331473 has 32 divisors (see below), whose sum is σ = 384854400. Its totient is φ = 156750336.

The previous prime is 261331397. The next prime is 261331489. The reversal of 261331473 is 374133162.

261331473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261331473 - 2¹³ = 261323281 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261331473.

It is not an unprimeable number, because it can be changed into a prime (261331493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 314823 + ... + 315651.

It is an arithmetic number, because the mean of its divisors is an integer number (12026700).

Almost surely, 2^261331473 is an apocalyptic number.

It is an amenable number.

261331473 is a deficient number, since it is larger than the sum of its proper divisors (123522927).

261331473 is a wasteful number, since it uses less digits than its factorization.

261331473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041.

The product of its digits is 9072, while the sum is 30.

The square root of 261331473 is about 16165.7499980669. The cubic root of 261331473 is about 639.3380794788.

The spelling of 261331473 in words is "two hundred sixty-one million, three hundred thirty-one thousand, four hundred seventy-three".