261486381 has 8 divisors (see below), whose sum is σ = 375467680. Its totient is φ = 160914672.

The previous prime is 261486377. The next prime is 261486403. The reversal of 261486381 is 183684162.

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

It is not a de Polignac number, because 261486381 - 2² = 261486377 is a prime.

It is a super-2 number, since 2×261486381² = 136750254896954322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 6704779 = 261486381 / (2 + 6 + 1 + 4 + 8 + 6 + 3 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261486331) 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, 3352351 + ... + 3352428.

It is an arithmetic number, because the mean of its divisors is an integer number (46933460).

Almost surely, 2^261486381 is an apocalyptic number.

It is an amenable number.

261486381 is a deficient number, since it is larger than the sum of its proper divisors (113981299).

261486381 is a wasteful number, since it uses less digits than its factorization.

261486381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6704795.

The product of its digits is 55296, while the sum is 39.

The square root of 261486381 is about 16170.5405289990. The cubic root of 261486381 is about 639.4643801493.

The spelling of 261486381 in words is "two hundred sixty-one million, four hundred eighty-six thousand, three hundred eighty-one".