261167141 has 16 divisors (see below), whose sum is σ = 291735360. Its totient is φ = 232346880.

The previous prime is 261167131. The next prime is 261167143. The reversal of 261167141 is 141761162.

It is a cyclic number.

It is not a de Polignac number, because 261167141 - 2¹⁰ = 261166117 is a prime.

It is a super-2 number, since 2×261167141² = 136416551076227762, 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 (261167143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261455 + ... + 262451.

It is an arithmetic number, because the mean of its divisors is an integer number (18233460).

Almost surely, 2^261167141 is an apocalyptic number.

It is an amenable number.

261167141 is a deficient number, since it is larger than the sum of its proper divisors (30568219).

261167141 is a wasteful number, since it uses less digits than its factorization.

261167141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844.

The product of its digits is 2016, while the sum is 29.

The square root of 261167141 is about 16160.6664775931. Note that the first 3 decimals coincide. The cubic root of 261167141 is about 639.2040405970.

The spelling of 261167141 in words is "two hundred sixty-one million, one hundred sixty-seven thousand, one hundred forty-one".