243256901 has 16 divisors (see below), whose sum is σ = 263813760. Its totient is φ = 223608000.

The previous prime is 243256877. The next prime is 243256919. The reversal of 243256901 is 109652342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243256901 - 2²² = 239062597 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 (243256921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166691 + ... + 168143.

It is an arithmetic number, because the mean of its divisors is an integer number (16488360).

Almost surely, 2^243256901 is an apocalyptic number.

It is an amenable number.

243256901 is a deficient number, since it is larger than the sum of its proper divisors (20556859).

243256901 is a wasteful number, since it uses less digits than its factorization.

243256901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 243256901 is about 15596.6951948161. The cubic root of 243256901 is about 624.2449771253.

The spelling of 243256901 in words is "two hundred forty-three million, two hundred fifty-six thousand, nine hundred one".