1972244605091 has 2 divisors, whose sum is σ = 1972244605092. Its totient is φ = 1972244605090.

The previous prime is 1972244605063. The next prime is 1972244605159. The reversal of 1972244605091 is 1905064422791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1972244605091 - 2²⁶ = 1972177496227 is a prime.

It is a super-3 number, since 3×1972244605091³ (a number of 38 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1972244605021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986122302545 + 986122302546.

It is an arithmetic number, because the mean of its divisors is an integer number (986122302546).

Almost surely, 2^{1972244605091} is an apocalyptic number.

1972244605091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972244605091 is an equidigital number, since it uses as much as digits as its factorization.

1972244605091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 1972244605091 in words is "one trillion, nine hundred seventy-two billion, two hundred forty-four million, six hundred five thousand, ninety-one".