261676417 has 4 divisors (see below), whose sum is σ = 275448880. Its totient is φ = 247903956.

The previous prime is 261676411. The next prime is 261676421. The reversal of 261676417 is 714676162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261676417 - 2²³ = 253287809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261676417.

It is not an unprimeable number, because it can be changed into a prime (261676411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6886203 + ... + 6886240.

It is an arithmetic number, because the mean of its divisors is an integer number (68862220).

Almost surely, 2^261676417 is an apocalyptic number.

It is an amenable number.

261676417 is a deficient number, since it is larger than the sum of its proper divisors (13772463).

261676417 is a wasteful number, since it uses less digits than its factorization.

261676417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13772462.

The product of its digits is 84672, while the sum is 40.

The square root of 261676417 is about 16176.4154558419. The cubic root of 261676417 is about 639.6192535131.

The spelling of 261676417 in words is "two hundred sixty-one million, six hundred seventy-six thousand, four hundred seventeen".