101219972489 has 2 divisors, whose sum is σ = 101219972490. Its totient is φ = 101219972488.

The previous prime is 101219972473. The next prime is 101219972537. The reversal of 101219972489 is 984279912101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81701647225 + 19518325264 = 285835^2 + 139708^2 .

It is a cyclic number.

It is not a de Polignac number, because 101219972489 - 2⁴ = 101219972473 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 101219972489.

It is not a weakly prime, because it can be changed into another prime (101219972089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50609986244 + 50609986245.

It is an arithmetic number, because the mean of its divisors is an integer number (50609986245).

Almost surely, 2^101219972489 is an apocalyptic number.

It is an amenable number.

101219972489 is a deficient number, since it is larger than the sum of its proper divisors (1).

101219972489 is an equidigital number, since it uses as much as digits as its factorization.

101219972489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 53.

The spelling of 101219972489 in words is "one hundred one billion, two hundred nineteen million, nine hundred seventy-two thousand, four hundred eighty-nine".