853961977 has 6 divisors (see below), whose sum is σ = 938652554. Its totient is φ = 776328960.

The previous prime is 853961951. The next prime is 853962001. The reversal of 853961977 is 779169358.

It can be written as a sum of positive squares in only one way, i.e., 428117481 + 425844496 = 20691^2 + 20636^2 .

It is a de Polignac number, because none of the positive numbers 2^k-853961977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853961177) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3528648 + ... + 3528889.

Almost surely, 2^853961977 is an apocalyptic number.

It is an amenable number.

853961977 is a deficient number, since it is larger than the sum of its proper divisors (84690577).

853961977 is a wasteful number, since it uses less digits than its factorization.

853961977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7057559 (or 7057548 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 55.

The square root of 853961977 is about 29222.6278250263. The cubic root of 853961977 is about 948.7377426128.

The spelling of 853961977 in words is "eight hundred fifty-three million, nine hundred sixty-one thousand, nine hundred seventy-seven".