261312411 has 8 divisors (see below), whose sum is σ = 348498000. Its totient is φ = 174167552.

The previous prime is 261312409. The next prime is 261312413. The reversal of 261312411 is 114213162.

It is an interprime number because it is at equal distance from previous prime (261312409) and next prime (261312413).

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 261312411 - 2¹ = 261312409 is a prime.

It is a super-2 number, since 2×261312411² = 136568352285265842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261312413) 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, 11215 + ... + 25463.

It is an arithmetic number, because the mean of its divisors is an integer number (43562250).

Almost surely, 2^261312411 is an apocalyptic number.

261312411 is a deficient number, since it is larger than the sum of its proper divisors (87185589).

261312411 is a wasteful number, since it uses less digits than its factorization.

261312411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20365.

The product of its digits is 288, while the sum is 21.

The square root of 261312411 is about 16165.1604074936. The cubic root of 261312411 is about 639.3225342676.

Adding to 261312411 its reverse (114213162), we get a palindrome (375525573).

The spelling of 261312411 in words is "two hundred sixty-one million, three hundred twelve thousand, four hundred eleven".