261149599 has 8 divisors (see below), whose sum is σ = 264045600. Its totient is φ = 258260736.

The previous prime is 261149593. The next prime is 261149627. The reversal of 261149599 is 995941162.

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 not a de Polignac number, because 261149599 - 2³ = 261149591 is a prime.

It is a super-2 number, since 2×261149599² = 136398226115721602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261149591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106839 + ... + 109255.

It is an arithmetic number, because the mean of its divisors is an integer number (33005700).

Almost surely, 2^261149599 is an apocalyptic number.

261149599 is a deficient number, since it is larger than the sum of its proper divisors (2896001).

261149599 is a wasteful number, since it uses less digits than its factorization.

261149599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3569.

The product of its digits is 174960, while the sum is 46.

The square root of 261149599 is about 16160.1237309620. The cubic root of 261149599 is about 639.1897289851.

The spelling of 261149599 in words is "two hundred sixty-one million, one hundred forty-nine thousand, five hundred ninety-nine".