261670149 has 32 divisors (see below), whose sum is σ = 435644160. Its totient is φ = 154021824.

The previous prime is 261670091. The next prime is 261670177. The reversal of 261670149 is 941076162.

It is not a de Polignac number, because 261670149 - 2⁹ = 261669637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261670049) 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 31 ways as a sum of consecutive naturals, for example, 8134 + ... + 24279.

It is an arithmetic number, because the mean of its divisors is an integer number (13613880).

Almost surely, 2^261670149 is an apocalyptic number.

It is an amenable number.

261670149 is a deficient number, since it is larger than the sum of its proper divisors (173974011).

261670149 is a wasteful number, since it uses less digits than its factorization.

261670149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32458 (or 32452 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 261670149 is about 16176.2217158396. The cubic root of 261670149 is about 639.6141464862.

The spelling of 261670149 in words is "two hundred sixty-one million, six hundred seventy thousand, one hundred forty-nine".