201493989 has 6 divisors (see below), whose sum is σ = 291046886. Its totient is φ = 134329320.

The previous prime is 201493951. The next prime is 201493997. The reversal of 201493989 is 989394102.

It can be written as a sum of positive squares in only one way, i.e., 144793089 + 56700900 = 12033^2 + 7530^2 .

It is not a de Polignac number, because 201493989 - 2⁷ = 201493861 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 (201493939) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11194102 + ... + 11194119.

Almost surely, 2^201493989 is an apocalyptic number.

It is an amenable number.

201493989 is a deficient number, since it is larger than the sum of its proper divisors (89552897).

201493989 is a wasteful number, since it uses less digits than its factorization.

201493989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22388227 (or 22388224 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 201493989 is about 14194.8578365548. The cubic root of 201493989 is about 586.2560869401.

It can be divided in two parts, 2014939 and 89, that added together give a triangular number (2015028 = T₂₀₀₇).

The spelling of 201493989 in words is "two hundred one million, four hundred ninety-three thousand, nine hundred eighty-nine".