1972731109529 has 2 divisors, whose sum is σ = 1972731109530. Its totient is φ = 1972731109528.

The previous prime is 1972731109507. The next prime is 1972731109537. The reversal of 1972731109529 is 9259011372791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1930576860304 + 42154249225 = 1389452^2 + 205315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1972731109529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1972731109229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986365554764 + 986365554765.

It is an arithmetic number, because the mean of its divisors is an integer number (986365554765).

Almost surely, 2^{1972731109529} is an apocalyptic number.

It is an amenable number.

1972731109529 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972731109529 is an equidigital number, since it uses as much as digits as its factorization.

1972731109529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2143260, while the sum is 56.

The spelling of 1972731109529 in words is "one trillion, nine hundred seventy-two billion, seven hundred thirty-one million, one hundred nine thousand, five hundred twenty-nine".