261913417 has 8 divisors (see below), whose sum is σ = 269248392. Its totient is φ = 254592000.

The previous prime is 261913403. The next prime is 261913427. The reversal of 261913417 is 714319162.

It can be written as a sum of positive squares in 4 ways, for example, as 33419961 + 228493456 = 5781^2 + 15116^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261913417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261913427) 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 7 ways as a sum of consecutive naturals, for example, 45417 + ... + 50857.

It is an arithmetic number, because the mean of its divisors is an integer number (33656049).

Almost surely, 2^261913417 is an apocalyptic number.

It is an amenable number.

261913417 is a deficient number, since it is larger than the sum of its proper divisors (7334975).

261913417 is a wasteful number, since it uses less digits than its factorization.

261913417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779.

The product of its digits is 9072, while the sum is 34.

The square root of 261913417 is about 16183.7392774352. The cubic root of 261913417 is about 639.8122960284.

The spelling of 261913417 in words is "two hundred sixty-one million, nine hundred thirteen thousand, four hundred seventeen".