261207133 has 4 divisors (see below), whose sum is σ = 284953248. Its totient is φ = 237461020.

The previous prime is 261207131. The next prime is 261207137. The reversal of 261207133 is 331702162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261207133 - 2¹ = 261207131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261207098 and 261207107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261207131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11873041 + ... + 11873062.

It is an arithmetic number, because the mean of its divisors is an integer number (71238312).

Almost surely, 2^261207133 is an apocalyptic number.

It is an amenable number.

261207133 is a deficient number, since it is larger than the sum of its proper divisors (23746115).

261207133 is a wasteful number, since it uses less digits than its factorization.

261207133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23746114.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 261207133 is about 16161.9037554367. The cubic root of 261207133 is about 639.2366656090.

Adding to 261207133 its reverse (331702162), we get a palindrome (592909295).

The spelling of 261207133 in words is "two hundred sixty-one million, two hundred seven thousand, one hundred thirty-three".