1945172201369 has 2 divisors, whose sum is σ = 1945172201370. Its totient is φ = 1945172201368.

The previous prime is 1945172201351. The next prime is 1945172201393. The reversal of 1945172201369 is 9631022715491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1636769685769 + 308402515600 = 1279363^2 + 555340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1945172201369 - 2²⁸ = 1944903765913 is a prime.

It is a super-2 number, since 2×1945172201369² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1945172201069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972586100684 + 972586100685.

It is an arithmetic number, because the mean of its divisors is an integer number (972586100685).

Almost surely, 2^{1945172201369} is an apocalyptic number.

It is an amenable number.

1945172201369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945172201369 is an equidigital number, since it uses as much as digits as its factorization.

1945172201369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 1945172201369 in words is "one trillion, nine hundred forty-five billion, one hundred seventy-two million, two hundred one thousand, three hundred sixty-nine".