261879701 has 4 divisors (see below), whose sum is σ = 266318400. Its totient is φ = 257441004.

The previous prime is 261879623. The next prime is 261879721. The reversal of 261879701 is 107978162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261879701 - 2¹⁴ = 261863317 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 (261879721) 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, 2219261 + ... + 2219378.

It is an arithmetic number, because the mean of its divisors is an integer number (66579600).

Almost surely, 2^261879701 is an apocalyptic number.

It is an amenable number.

261879701 is a deficient number, since it is larger than the sum of its proper divisors (4438699).

261879701 is an equidigital number, since it uses as much as digits as its factorization.

261879701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4438698.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 261879701 is about 16182.6975810586. The cubic root of 261879701 is about 639.7848405976.

The spelling of 261879701 in words is "two hundred sixty-one million, eight hundred seventy-nine thousand, seven hundred one".