853971949 has 2 divisors, whose sum is σ = 853971950. Its totient is φ = 853971948.

The previous prime is 853971917. The next prime is 853971953. The reversal of 853971949 is 949179358.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 532917225 + 321054724 = 23085^2 + 17918^2 .

It is a cyclic number.

It is not a de Polignac number, because 853971949 - 2⁵ = 853971917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 853971949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (853972949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426985974 + 426985975.

It is an arithmetic number, because the mean of its divisors is an integer number (426985975).

Almost surely, 2^853971949 is an apocalyptic number.

It is an amenable number.

853971949 is a deficient number, since it is larger than the sum of its proper divisors (1).

853971949 is an equidigital number, since it uses as much as digits as its factorization.

853971949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 55.

The square root of 853971949 is about 29222.7984457341. The cubic root of 853971949 is about 948.7414355078.

The spelling of 853971949 in words is "eight hundred fifty-three million, nine hundred seventy-one thousand, nine hundred forty-nine".