242561431 has 4 divisors (see below), whose sum is σ = 277213072. Its totient is φ = 207909792.

The previous prime is 242561419. The next prime is 242561477. The reversal of 242561431 is 134165242.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 242561431 - 2²³ = 234172823 is a prime.

It is a super-2 number, since 2×242561431² = 117672095617535522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 242561431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242565431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17325810 + ... + 17325823.

It is an arithmetic number, because the mean of its divisors is an integer number (69303268).

Almost surely, 2^242561431 is an apocalyptic number.

242561431 is a deficient number, since it is larger than the sum of its proper divisors (34651641).

242561431 is an equidigital number, since it uses as much as digits as its factorization.

242561431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34651640.

The product of its digits is 5760, while the sum is 28.

The square root of 242561431 is about 15574.3838080356. The cubic root of 242561431 is about 623.6495050834.

The spelling of 242561431 in words is "two hundred forty-two million, five hundred sixty-one thousand, four hundred thirty-one".