1971885953 has 2 divisors, whose sum is σ = 1971885954. Its totient is φ = 1971885952.

The previous prime is 1971885901. The next prime is 1971885961. The reversal of 1971885953 is 3595881791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1285079104 + 686806849 = 35848^2 + 26207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1971885953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1971885353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985942976 + 985942977.

It is an arithmetic number, because the mean of its divisors is an integer number (985942977).

Almost surely, 2^1971885953 is an apocalyptic number.

It is an amenable number.

1971885953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971885953 is an equidigital number, since it uses as much as digits as its factorization.

1971885953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 56.

The square root of 1971885953 is about 44405.9224991442. The cubic root of 1971885953 is about 1253.9895896326.

The spelling of 1971885953 in words is "one billion, nine hundred seventy-one million, eight hundred eighty-five thousand, nine hundred fifty-three".