261216277 has 8 divisors (see below), whose sum is σ = 304166016. Its totient is φ = 219674832.

The previous prime is 261216269. The next prime is 261216331. The reversal of 261216277 is 772612162.

261216277 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 261216277 - 2³ = 261216269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261216217) 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, 351673 + ... + 352414.

It is an arithmetic number, because the mean of its divisors is an integer number (38020752).

Almost surely, 2^261216277 is an apocalyptic number.

It is an amenable number.

261216277 is a deficient number, since it is larger than the sum of its proper divisors (42949739).

261216277 is an equidigital number, since it uses as much as digits as its factorization.

261216277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704147.

The product of its digits is 14112, while the sum is 34.

The square root of 261216277 is about 16162.1866404271. The cubic root of 261216277 is about 639.2441247109.

The spelling of 261216277 in words is "two hundred sixty-one million, two hundred sixteen thousand, two hundred seventy-seven".