849777861 has 8 divisors (see below), whose sum is σ = 1199686464. Its totient is φ = 533193920.

The previous prime is 849777833. The next prime is 849777871. The reversal of 849777861 is 168777948.

It is a happy number.

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 849777861 - 2¹⁴ = 849761477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849777871) 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, 8331105 + ... + 8331206.

It is an arithmetic number, because the mean of its divisors is an integer number (149960808).

Almost surely, 2^849777861 is an apocalyptic number.

It is an amenable number.

849777861 is a deficient number, since it is larger than the sum of its proper divisors (349908603).

849777861 is a wasteful number, since it uses less digits than its factorization.

849777861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16662331.

The product of its digits is 4741632, while the sum is 57.

The square root of 849777861 is about 29150.9495728698. The cubic root of 849777861 is about 947.1857103026.

The spelling of 849777861 in words is "eight hundred forty-nine million, seven hundred seventy-seven thousand, eight hundred sixty-one".