261133351 has 4 divisors (see below), whose sum is σ = 265559400. Its totient is φ = 256707304.

The previous prime is 261133349. The next prime is 261133357. The reversal of 261133351 is 153331162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261133351 - 2¹ = 261133349 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 (261133357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2212936 + ... + 2213053.

It is an arithmetic number, because the mean of its divisors is an integer number (66389850).

Almost surely, 2^261133351 is an apocalyptic number.

261133351 is a deficient number, since it is larger than the sum of its proper divisors (4426049).

261133351 is an equidigital number, since it uses as much as digits as its factorization.

261133351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4426048.

The product of its digits is 1620, while the sum is 25.

The square root of 261133351 is about 16159.6210042191. The cubic root of 261133351 is about 639.1764725092.

The spelling of 261133351 in words is "two hundred sixty-one million, one hundred thirty-three thousand, three hundred fifty-one".