1201800889 has 3 divisors (see below), whose sum is σ = 1201835557. Its totient is φ = 1201766222.

The previous prime is 1201800871. The next prime is 1201800893. The reversal of 1201800889 is 9880081021.

The square root of 1201800889 is 34667.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1201800889 - 2²¹ = 1199703737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201800289) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17334 + ... + 52000.

Almost surely, 2^1201800889 is an apocalyptic number.

1201800889 is the 34667-th square number.

1201800889 is the 17334-th centered octagonal number.

It is an amenable number.

1201800889 is a deficient number, since it is larger than the sum of its proper divisors (34668).

1201800889 is an frugal number, since it uses more digits than its factorization.

1201800889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69334 (or 34667 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The cubic root of 1201800889 is about 1063.1898951792.

Multiplying 1201800889 by its product of nonzero digits (9216), we get a square (11075796993024 = 3328032²).

The spelling of 1201800889 in words is "one billion, two hundred one million, eight hundred thousand, eight hundred eighty-nine".