856111949 has 8 divisors (see below), whose sum is σ = 1067360448. Its totient is φ = 667100160.

The previous prime is 856111943. The next prime is 856111961. The reversal of 856111949 is 949111658.

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 856111949 - 2¹⁶ = 856046413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856111943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5559092 + ... + 5559245.

It is an arithmetic number, because the mean of its divisors is an integer number (133420056).

Almost surely, 2^856111949 is an apocalyptic number.

It is an amenable number.

856111949 is a deficient number, since it is larger than the sum of its proper divisors (211248499).

856111949 is a wasteful number, since it uses less digits than its factorization.

856111949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11118355.

The product of its digits is 77760, while the sum is 44.

The square root of 856111949 is about 29259.3907831315. The cubic root of 856111949 is about 949.5332699044.

The spelling of 856111949 in words is "eight hundred fifty-six million, one hundred eleven thousand, nine hundred forty-nine".