261481917 has 8 divisors (see below), whose sum is σ = 363801024. Its totient is φ = 166742048.

The previous prime is 261481903. The next prime is 261481921. The reversal of 261481917 is 719184162.

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 261481917 - 2¹⁹ = 260957629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261481967) 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, 1894728 + ... + 1894865.

It is an arithmetic number, because the mean of its divisors is an integer number (45475128).

Almost surely, 2^261481917 is an apocalyptic number.

It is an amenable number.

261481917 is a deficient number, since it is larger than the sum of its proper divisors (102319107).

261481917 is a wasteful number, since it uses less digits than its factorization.

261481917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3789619.

The product of its digits is 24192, while the sum is 39.

The square root of 261481917 is about 16170.4024996288. The cubic root of 261481917 is about 639.4607412278.

The spelling of 261481917 in words is "two hundred sixty-one million, four hundred eighty-one thousand, nine hundred seventeen".