1972901817087 has 4 divisors (see below), whose sum is σ = 2630535756120. Its totient is φ = 1315267878056.

The previous prime is 1972901817049. The next prime is 1972901817143. The reversal of 1972901817087 is 7807181092791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1972901817087 - 2²² = 1972897622783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1972901817087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1972901817487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328816969512 + ... + 328816969517.

It is an arithmetic number, because the mean of its divisors is an integer number (657633939030).

Almost surely, 2^{1972901817087} is an apocalyptic number.

1972901817087 is a deficient number, since it is larger than the sum of its proper divisors (657633939033).

1972901817087 is an equidigital number, since it uses as much as digits as its factorization.

1972901817087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657633939032.

The product of its (nonzero) digits is 3556224, while the sum is 60.

The spelling of 1972901817087 in words is "one trillion, nine hundred seventy-two billion, nine hundred one million, eight hundred seventeen thousand, eighty-seven".