261375087 has 8 divisors (see below), whose sum is σ = 348705280. Its totient is φ = 174147480.

The previous prime is 261375073. The next prime is 261375089. The reversal of 261375087 is 780573162.

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

It is not a de Polignac number, because 261375087 - 2⁴ = 261375071 is a prime.

It is a super-2 number, since 2×261375087² = 136633872208515138, 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 (261375089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19489 + ... + 30042.

It is an arithmetic number, because the mean of its divisors is an integer number (43588160).

Almost surely, 2^261375087 is an apocalyptic number.

261375087 is a deficient number, since it is larger than the sum of its proper divisors (87330193).

261375087 is a wasteful number, since it uses less digits than its factorization.

261375087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51293.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 261375087 is about 16167.0989048747. The cubic root of 261375087 is about 639.3736441962.

The spelling of 261375087 in words is "two hundred sixty-one million, three hundred seventy-five thousand, eighty-seven".