1972217971 has 2 divisors, whose sum is σ = 1972217972. Its totient is φ = 1972217970.

The previous prime is 1972217911. The next prime is 1972217977. The reversal of 1972217971 is 1797122791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1972217971 - 2²¹ = 1970120819 is a prime.

It is not a weakly prime, because it can be changed into another prime (1972217977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986108985 + 986108986.

It is an arithmetic number, because the mean of its divisors is an integer number (986108986).

Almost surely, 2^1972217971 is an apocalyptic number.

1972217971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972217971 is an equidigital number, since it uses as much as digits as its factorization.

1972217971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111132, while the sum is 46.

The square root of 1972217971 is about 44409.6607845635. The cubic root of 1972217971 is about 1254.0599662095.

The spelling of 1972217971 in words is "one billion, nine hundred seventy-two million, two hundred seventeen thousand, nine hundred seventy-one".