1971945629 has 2 divisors, whose sum is σ = 1971945630. Its totient is φ = 1971945628.

The previous prime is 1971945593. The next prime is 1971945649. The reversal of 1971945629 is 9265491791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1921507225 + 50438404 = 43835^2 + 7102^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971945629 - 2⁸ = 1971945373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971945649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985972814 + 985972815.

It is an arithmetic number, because the mean of its divisors is an integer number (985972815).

Almost surely, 2^1971945629 is an apocalyptic number.

It is an amenable number.

1971945629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971945629 is an equidigital number, since it uses as much as digits as its factorization.

1971945629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 53.

The square root of 1971945629 is about 44406.5944314580. The cubic root of 1971945629 is about 1254.0022395069.

The spelling of 1971945629 in words is "one billion, nine hundred seventy-one million, nine hundred forty-five thousand, six hundred twenty-nine".