242309561 has 16 divisors (see below), whose sum is σ = 264272064. Its totient is φ = 220843584.

The previous prime is 242309461. The next prime is 242309567. The reversal of 242309561 is 165903242.

It is a happy number.

It is not a de Polignac number, because 242309561 - 2¹⁰ = 242308537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242309567) 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, 463046 + ... + 463568.

It is an arithmetic number, because the mean of its divisors is an integer number (16517004).

Almost surely, 2^242309561 is an apocalyptic number.

It is an amenable number.

242309561 is a deficient number, since it is larger than the sum of its proper divisors (21962503).

242309561 is a wasteful number, since it uses less digits than its factorization.

242309561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920.

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

The square root of 242309561 is about 15566.2956736662. The cubic root of 242309561 is about 623.4335694055.

The spelling of 242309561 in words is "two hundred forty-two million, three hundred nine thousand, five hundred sixty-one".