261475849 has 4 divisors (see below), whose sum is σ = 263874820. Its totient is φ = 259076880.

The previous prime is 261475843. The next prime is 261475867. The reversal of 261475849 is 948574162.

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

It can be written as a sum of positive squares in 2 ways, for example, as 141967225 + 119508624 = 11915^2 + 10932^2 .

It is a cyclic number.

It is not a de Polignac number, because 261475849 - 2¹⁵ = 261443081 is a prime.

It is a super-2 number, since 2×261475849² = 136739239220541602, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261475799 and 261475808.

It is not an unprimeable number, because it can be changed into a prime (261475843) 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, 1199322 + ... + 1199539.

It is an arithmetic number, because the mean of its divisors is an integer number (65968705).

Almost surely, 2^261475849 is an apocalyptic number.

It is an amenable number.

261475849 is a deficient number, since it is larger than the sum of its proper divisors (2398971).

261475849 is a wasteful number, since it uses less digits than its factorization.

261475849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398970.

The product of its digits is 483840, while the sum is 46.

The square root of 261475849 is about 16170.2148717944. The cubic root of 261475849 is about 639.4557947063.

The spelling of 261475849 in words is "two hundred sixty-one million, four hundred seventy-five thousand, eight hundred forty-nine".