1972905072491 has 2 divisors, whose sum is σ = 1972905072492. Its totient is φ = 1972905072490.

The previous prime is 1972905072473. The next prime is 1972905072563. The reversal of 1972905072491 is 1942705092791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1972905072491 - 2⁶ = 1972905072427 is a prime.

It is not a weakly prime, because it can be changed into another prime (1972905072431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986452536245 + 986452536246.

It is an arithmetic number, because the mean of its divisors is an integer number (986452536246).

Almost surely, 2^{1972905072491} is an apocalyptic number.

1972905072491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972905072491 is an equidigital number, since it uses as much as digits as its factorization.

1972905072491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2857680, while the sum is 56.

The spelling of 1972905072491 in words is "one trillion, nine hundred seventy-two billion, nine hundred five million, seventy-two thousand, four hundred ninety-one".