1897021101 has 4 divisors (see below), whose sum is σ = 2529361472. Its totient is φ = 1264680732.

The previous prime is 1897021073. The next prime is 1897021111. The reversal of 1897021101 is 1011207981.

1897021101 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1897021101 - 2¹⁸ = 1896758957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897021111) 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, 316170181 + ... + 316170186.

It is an arithmetic number, because the mean of its divisors is an integer number (632340368).

Almost surely, 2^1897021101 is an apocalyptic number.

It is an amenable number.

1897021101 is a deficient number, since it is larger than the sum of its proper divisors (632340371).

1897021101 is an equidigital number, since it uses as much as digits as its factorization.

1897021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632340370.

The product of its (nonzero) digits is 1008, while the sum is 30.

The square root of 1897021101 is about 43554.8057164763. The cubic root of 1897021101 is about 1237.9147012131.

The spelling of 1897021101 in words is "one billion, eight hundred ninety-seven million, twenty-one thousand, one hundred one".