1897021513939 has 4 divisors (see below), whose sum is σ = 1903724770456. Its totient is φ = 1890318257424.

The previous prime is 1897021513931. The next prime is 1897021513967. The reversal of 1897021513939 is 9393151207981.

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 1897021513939 - 2³ = 1897021513931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1897021513931) 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, 3351627834 + ... + 3351628399.

It is an arithmetic number, because the mean of its divisors is an integer number (475931192614).

Almost surely, 2^{1897021513939} is an apocalyptic number.

1897021513939 is a deficient number, since it is larger than the sum of its proper divisors (6703256517).

1897021513939 is an equidigital number, since it uses as much as digits as its factorization.

1897021513939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6703256516.

The product of its (nonzero) digits is 3674160, while the sum is 58.

The spelling of 1897021513939 in words is "one trillion, eight hundred ninety-seven billion, twenty-one million, five hundred thirteen thousand, nine hundred thirty-nine".