261236601 has 24 divisors (see below), whose sum is σ = 387616320. Its totient is φ = 169476000.

The previous prime is 261236581. The next prime is 261236623. The reversal of 261236601 is 106632162.

261236601 is a `hidden beast` number, since 26 + 1 + 2 + 36 + 601 = 666.

It is not a de Polignac number, because 261236601 - 2¹⁴ = 261220217 is a prime.

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, 51196 + ... + 56066.

It is an arithmetic number, because the mean of its divisors is an integer number (16150680).

Almost surely, 2^261236601 is an apocalyptic number.

It is an amenable number.

261236601 is a deficient number, since it is larger than the sum of its proper divisors (126379719).

261236601 is a wasteful number, since it uses less digits than its factorization.

261236601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5037 (or 5034 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 261236601 is about 16162.8153797536. The cubic root of 261236601 is about 639.2607031324.

Adding to 261236601 its reverse (106632162), we get a palindrome (367868763).

The spelling of 261236601 in words is "two hundred sixty-one million, two hundred thirty-six thousand, six hundred one".