261031228 has 12 divisors (see below), whose sum is σ = 460402432. Its totient is φ = 129487680.

The previous prime is 261031219. The next prime is 261031229. The reversal of 261031228 is 822130162.

261031228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261031229) 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, 256413 + ... + 257428.

Almost surely, 2^261031228 is an apocalyptic number.

It is an amenable number.

261031228 is a deficient number, since it is larger than the sum of its proper divisors (199371204).

261031228 is a wasteful number, since it uses less digits than its factorization.

261031228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513972 (or 513970 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 261031228 is about 16156.4608748327. The cubic root of 261031228 is about 639.0931394412.

The spelling of 261031228 in words is "two hundred sixty-one million, thirty-one thousand, two hundred twenty-eight".