261236241 has 24 divisors (see below), whose sum is σ = 431672384. Its totient is φ = 149130720.

The previous prime is 261236233. The next prime is 261236273. The reversal of 261236241 is 142632162.

261236241 is a `hidden beast` number, since 2 + 612 + 3 + 6 + 2 + 41 = 666.

It is not a de Polignac number, because 261236241 - 2³ = 261236233 is a prime.

It is a super-2 number, since 2×261236241² = 136488747223620162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261236201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116511 + ... + 118731.

Almost surely, 2^261236241 is an apocalyptic number.

261236241 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

261236241 is a deficient number, since it is larger than the sum of its proper divisors (170436143).

261236241 is a wasteful number, since it uses less digits than its factorization.

261236241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4101 (or 4098 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 261236241 is about 16162.8042430761. The cubic root of 261236241 is about 639.2604094855.

The spelling of 261236241 in words is "two hundred sixty-one million, two hundred thirty-six thousand, two hundred forty-one".