861953417 has 4 divisors (see below), whose sum is σ = 928257540. Its totient is φ = 795649296.

The previous prime is 861953387. The next prime is 861953441. The reversal of 861953417 is 714359168.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40500496 + 821452921 = 6364^2 + 28661^2 .

It is not a de Polignac number, because 861953417 - 2⁶ = 861953353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861953117) 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, 33152042 + ... + 33152067.

It is an arithmetic number, because the mean of its divisors is an integer number (232064385).

Almost surely, 2^861953417 is an apocalyptic number.

It is an amenable number.

861953417 is a deficient number, since it is larger than the sum of its proper divisors (66304123).

861953417 is a wasteful number, since it uses less digits than its factorization.

861953417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66304122.

The product of its digits is 181440, while the sum is 44.

The square root of 861953417 is about 29359.0431894502. The cubic root of 861953417 is about 951.6880116152.

The spelling of 861953417 in words is "eight hundred sixty-one million, nine hundred fifty-three thousand, four hundred seventeen".