261071881 has 8 divisors (see below), whose sum is σ = 299868800. Its totient is φ = 222650208.

The previous prime is 261071869. The next prime is 261071897. The reversal of 261071881 is 188170162.

261071881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 261071881 - 2⁵ = 261071849 is a prime.

It is a super-5 number, since 5×261071881⁵ (a number of 43 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (261071821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92316 + ... + 95101.

It is an arithmetic number, because the mean of its divisors is an integer number (37483600).

Almost surely, 2^261071881 is an apocalyptic number.

It is an amenable number.

261071881 is a deficient number, since it is larger than the sum of its proper divisors (38796919).

261071881 is a wasteful number, since it uses less digits than its factorization.

261071881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187623.

The product of its (nonzero) digits is 5376, while the sum is 34.

The square root of 261071881 is about 16157.7189293539. The cubic root of 261071881 is about 639.1263151714.

The spelling of 261071881 in words is "two hundred sixty-one million, seventy-one thousand, eight hundred eighty-one".