261071151 has 16 divisors (see below), whose sum is σ = 380425728. Its totient is φ = 157939200.

The previous prime is 261071147. The next prime is 261071171. The reversal of 261071151 is 151170162.

It is not a de Polignac number, because 261071151 - 2² = 261071147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261071101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12186 + ... + 25896.

It is an arithmetic number, because the mean of its divisors is an integer number (23776608).

Almost surely, 2^261071151 is an apocalyptic number.

261071151 is a deficient number, since it is larger than the sum of its proper divisors (119354577).

261071151 is a wasteful number, since it uses less digits than its factorization.

261071151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14302.

The product of its (nonzero) digits is 420, while the sum is 24.

The square root of 261071151 is about 16157.6963395157. The cubic root of 261071151 is about 639.1257194700.

The spelling of 261071151 in words is "two hundred sixty-one million, seventy-one thousand, one hundred fifty-one".