1972901817049 has 2 divisors, whose sum is σ = 1972901817050. Its totient is φ = 1972901817048.

The previous prime is 1972901817043. The next prime is 1972901817143. The reversal of 1972901817049 is 9407181092791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1705335633225 + 267566183824 = 1305885^2 + 517268^2 .

It is a cyclic number.

It is not a de Polignac number, because 1972901817049 - 2⁹ = 1972901816537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1972901816984 and 1972901817002.

It is not a weakly prime, because it can be changed into another prime (1972901817043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986450908524 + 986450908525.

It is an arithmetic number, because the mean of its divisors is an integer number (986450908525).

Almost surely, 2^{1972901817049} is an apocalyptic number.

It is an amenable number.

1972901817049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972901817049 is an equidigital number, since it uses as much as digits as its factorization.

1972901817049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 58.

The spelling of 1972901817049 in words is "one trillion, nine hundred seventy-two billion, nine hundred one million, eight hundred seventeen thousand, forty-nine".