1971285497 has 2 divisors, whose sum is σ = 1971285498. Its totient is φ = 1971285496.

The previous prime is 1971285451. The next prime is 1971285517. The reversal of 1971285497 is 7945821791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1825938361 + 145347136 = 42731^2 + 12056^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971285497 - 2⁸ = 1971285241 is a prime.

It is not a weakly prime, because it can be changed into another prime (1971285427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985642748 + 985642749.

It is an arithmetic number, because the mean of its divisors is an integer number (985642749).

Almost surely, 2^1971285497 is an apocalyptic number.

It is an amenable number.

1971285497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971285497 is an equidigital number, since it uses as much as digits as its factorization.

1971285497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 53.

The square root of 1971285497 is about 44399.1609943251. The cubic root of 1971285497 is about 1253.8622932217.

The spelling of 1971285497 in words is "one billion, nine hundred seventy-one million, two hundred eighty-five thousand, four hundred ninety-seven".