261163051 has 4 divisors (see below), whose sum is σ = 261391104. Its totient is φ = 260935000.

The previous prime is 261163043. The next prime is 261163093. The reversal of 261163051 is 150361162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261163051 - 2³ = 261163043 is a prime.

It is a super-2 number, since 2×261163051² = 136412278415257202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261163751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112300 + ... + 114601.

It is an arithmetic number, because the mean of its divisors is an integer number (65347776).

Almost surely, 2^261163051 is an apocalyptic number.

261163051 is a deficient number, since it is larger than the sum of its proper divisors (228053).

261163051 is a wasteful number, since it uses less digits than its factorization.

261163051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228052.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 261163051 is about 16160.5399352868. The cubic root of 261163051 is about 639.2007038345.

The spelling of 261163051 in words is "two hundred sixty-one million, one hundred sixty-three thousand, fifty-one".