261363258 has 24 divisors (see below), whose sum is σ = 609848148. Its totient is φ = 80419392.

The previous prime is 261363251. The next prime is 261363281. The reversal of 261363258 is 852363162.

It is a happy number.

261363258 is a `hidden beast` number, since 2 + 6 + 13 + 632 + 5 + 8 = 666.

261363258 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 259628769 + 1734489 = 16113^2 + 1317^2 .

It is not an unprimeable number, because it can be changed into a prime (261363251) 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, 558235 + ... + 558702.

Almost surely, 2^261363258 is an apocalyptic number.

261363258 is an abundant number, since it is smaller than the sum of its proper divisors (348484890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261363258 is a wasteful number, since it uses less digits than its factorization.

261363258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116958 (or 1116955 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 261363258 is about 16166.7330651557. The cubic root of 261363258 is about 639.3639987157.

The spelling of 261363258 in words is "two hundred sixty-one million, three hundred sixty-three thousand, two hundred fifty-eight".