261319089 has 8 divisors (see below), whose sum is σ = 349015392. Its totient is φ = 173917760.

The previous prime is 261319033. The next prime is 261319099. The reversal of 261319089 is 980913162.

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 261319089 - 2¹¹ = 261317041 is a prime.

It is a super-3 number, since 3×261319089³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (261319099) 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, 71667 + ... + 75224.

It is an arithmetic number, because the mean of its divisors is an integer number (43626924).

Almost surely, 2^261319089 is an apocalyptic number.

It is an amenable number.

261319089 is a deficient number, since it is larger than the sum of its proper divisors (87696303).

261319089 is a wasteful number, since it uses less digits than its factorization.

261319089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147487.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 261319089 is about 16165.3669615014. The cubic root of 261319089 is about 639.3279803153.

The spelling of 261319089 in words is "two hundred sixty-one million, three hundred nineteen thousand, eighty-nine".