261960511 has 8 divisors (see below), whose sum is σ = 264109824. Its totient is φ = 259819680.

The previous prime is 261960499. The next prime is 261960527. The reversal of 261960511 is 115069162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261960511 - 2⁷ = 261960383 is a prime.

It is a super-2 number, since 2×261960511² = 137246618646762242, 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 (261960541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69405 + ... + 73081.

It is an arithmetic number, because the mean of its divisors is an integer number (33013728).

Almost surely, 2^261960511 is an apocalyptic number.

261960511 is a deficient number, since it is larger than the sum of its proper divisors (2149313).

261960511 is a wasteful number, since it uses less digits than its factorization.

261960511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4241.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 261960511 is about 16185.1941909883. The cubic root of 261960511 is about 639.8506414160.

The spelling of 261960511 in words is "two hundred sixty-one million, nine hundred sixty thousand, five hundred eleven".