261412281 has 48 divisors (see below), whose sum is σ = 433689984. Its totient is φ = 150308352.

The previous prime is 261412259. The next prime is 261412309. The reversal of 261412281 is 182214162.

It is not a de Polignac number, because 261412281 - 2⁷ = 261412153 is a prime.

It is a super-2 number, since 2×261412281² = 136672761315245922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261412211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 331770 + ... + 332556.

It is an arithmetic number, because the mean of its divisors is an integer number (9035208).

Almost surely, 2^261412281 is an apocalyptic number.

It is an amenable number.

261412281 is a deficient number, since it is larger than the sum of its proper divisors (172277703).

261412281 is a wasteful number, since it uses less digits than its factorization.

261412281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990 (or 987 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 261412281 is about 16168.2491630974. The cubic root of 261412281 is about 639.4039706460.

The spelling of 261412281 in words is "two hundred sixty-one million, four hundred twelve thousand, two hundred eighty-one".