261554285 has 16 divisors (see below), whose sum is σ = 341045760. Its totient is φ = 191833920.

The previous prime is 261554269. The next prime is 261554287. The reversal of 261554285 is 582455162.

261554285 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 261554285 - 2⁴ = 261554269 is a prime.

It is a super-2 number, since 2×261554285² = 136821288003722450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261554287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41462 + ... + 47351.

It is an arithmetic number, because the mean of its divisors is an integer number (21315360).

Almost surely, 2^261554285 is an apocalyptic number.

It is an amenable number.

261554285 is a deficient number, since it is larger than the sum of its proper divisors (79491475).

261554285 is a wasteful number, since it uses less digits than its factorization.

261554285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88868.

The product of its digits is 96000, while the sum is 38.

The square root of 261554285 is about 16172.6400133064. The cubic root of 261554285 is about 639.5197283870.

The spelling of 261554285 in words is "two hundred sixty-one million, five hundred fifty-four thousand, two hundred eighty-five".