261600291 has 6 divisors (see below), whose sum is σ = 377867100. Its totient is φ = 174400188.

The previous prime is 261600263. The next prime is 261600293. The reversal of 261600291 is 192006162.

It is not a de Polignac number, because 261600291 - 2⁵ = 261600259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261600293) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14533341 + ... + 14533358.

It is an arithmetic number, because the mean of its divisors is an integer number (62977850).

Almost surely, 2^261600291 is an apocalyptic number.

261600291 is a deficient number, since it is larger than the sum of its proper divisors (116266809).

261600291 is a wasteful number, since it uses less digits than its factorization.

261600291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29066705 (or 29066702 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 261600291 is about 16174.0622912118. The cubic root of 261600291 is about 639.5572222222.

The spelling of 261600291 in words is "two hundred sixty-one million, six hundred thousand, two hundred ninety-one".