261612481 has 16 divisors (see below), whose sum is σ = 290594304. Its totient is φ = 233999424.

The previous prime is 261612479. The next prime is 261612487. The reversal of 261612481 is 184216162.

It is a cyclic number.

It is not a de Polignac number, because 261612481 - 2¹ = 261612479 is a prime.

It is a super-2 number, since 2×261612481² = 136882180429950722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261612487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60855 + ... + 65011.

It is an arithmetic number, because the mean of its divisors is an integer number (18162144).

Almost surely, 2^261612481 is an apocalyptic number.

It is an amenable number.

261612481 is a deficient number, since it is larger than the sum of its proper divisors (28981823).

261612481 is a wasteful number, since it uses less digits than its factorization.

261612481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4320.

The product of its digits is 4608, while the sum is 31.

The square root of 261612481 is about 16174.4391247425. The cubic root of 261612481 is about 639.5671560560.

The spelling of 261612481 in words is "two hundred sixty-one million, six hundred twelve thousand, four hundred eighty-one".