261075879 has 10 divisors (see below), whose sum is σ = 390002360. Its totient is φ = 174050532.

The previous prime is 261075877. The next prime is 261075887. The reversal of 261075879 is 978570162.

261075879 is a `hidden beast` number, since 2 + 61 + 0 + 7 + 587 + 9 = 666.

It is not a de Polignac number, because 261075879 - 2¹ = 261075877 is a prime.

It is a super-2 number, since 2×261075879² = 136321229191245282, 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 (261075877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1611499 + ... + 1611660.

It is an arithmetic number, because the mean of its divisors is an integer number (39000236).

Almost surely, 2^261075879 is an apocalyptic number.

261075879 is a deficient number, since it is larger than the sum of its proper divisors (128926481).

261075879 is an equidigital number, since it uses as much as digits as its factorization.

261075879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223171 (or 3223162 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 261075879 is about 16157.8426468387. The cubic root of 261075879 is about 639.1295776368.

The spelling of 261075879 in words is "two hundred sixty-one million, seventy-five thousand, eight hundred seventy-nine".