1972171843027 has 2 divisors, whose sum is σ = 1972171843028. Its totient is φ = 1972171843026.

The previous prime is 1972171843003. The next prime is 1972171843051. The reversal of 1972171843027 is 7203481712791.

It is a balanced prime because it is at equal distance from previous prime (1972171843003) and next prime (1972171843051).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1972171843027 is a prime.

It is not a weakly prime, because it can be changed into another prime (1972171840027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986085921513 + 986085921514.

It is an arithmetic number, because the mean of its divisors is an integer number (986085921514).

Almost surely, 2^{1972171843027} is an apocalyptic number.

1972171843027 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972171843027 is an equidigital number, since it uses as much as digits as its factorization.

1972171843027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The spelling of 1972171843027 in words is "one trillion, nine hundred seventy-two billion, one hundred seventy-one million, eight hundred forty-three thousand, twenty-seven".