261040901 has 8 divisors (see below), whose sum is σ = 286051584. Its totient is φ = 236243520.

The previous prime is 261040889. The next prime is 261040921. The reversal of 261040901 is 109040162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261040901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261040921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50756 + ... + 55661.

It is an arithmetic number, because the mean of its divisors is an integer number (35756448).

Almost surely, 2^261040901 is an apocalyptic number.

It is an amenable number.

261040901 is a deficient number, since it is larger than the sum of its proper divisors (25010683).

261040901 is a wasteful number, since it uses less digits than its factorization.

261040901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106651.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 261040901 is about 16156.7602259859. The cubic root of 261040901 is about 639.1010336072.

The spelling of 261040901 in words is "two hundred sixty-one million, forty thousand, nine hundred one".