243493889401 has 27 divisors (see below), whose sum is σ = 285699911949. Its totient is φ = 206917820928.

The previous prime is 243493889393. The next prime is 243493889407. The reversal of 243493889401 is 104988394342.

The square root of 243493889401 is 493451.

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

It can be written as a sum of positive squares in 4 ways, for example, as 2487515625 + 241006373776 = 49875^2 + 490924^2 .

It is not a de Polignac number, because 243493889401 - 2³ = 243493889393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243493889407) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 542302425 + ... + 542302873.

Almost surely, 2^243493889401 is an apocalyptic number.

243493889401 is the 493451-st square number.

243493889401 is the 246726-th centered octagonal number.

It is an amenable number.

243493889401 is a deficient number, since it is larger than the sum of its proper divisors (42206022548).

243493889401 is an frugal number, since it uses more digits than its factorization.

243493889401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226 (or 613 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 55.

The spelling of 243493889401 in words is "two hundred forty-three billion, four hundred ninety-three million, eight hundred eighty-nine thousand, four hundred one".