261047151 has 16 divisors (see below), whose sum is σ = 390355200. Its totient is φ = 172403064.

The previous prime is 261047141. The next prime is 261047153. The reversal of 261047151 is 151740162.

It is a happy number.

261047151 is a `hidden beast` number, since 2 + 610 + 47 + 1 + 5 + 1 = 666.

It is not a de Polignac number, because 261047151 - 2⁵ = 261047119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261047153) 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, 42291 + ... + 48068.

It is an arithmetic number, because the mean of its divisors is an integer number (24397200).

Almost surely, 2^261047151 is an apocalyptic number.

261047151 is a deficient number, since it is larger than the sum of its proper divisors (129308049).

261047151 is a wasteful number, since it uses less digits than its factorization.

261047151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90475 (or 90469 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 261047151 is about 16156.9536423176. The cubic root of 261047151 is about 639.1061341484.

The spelling of 261047151 in words is "two hundred sixty-one million, forty-seven thousand, one hundred fifty-one".