242501531 has 2 divisors, whose sum is σ = 242501532. Its totient is φ = 242501530.

The previous prime is 242501527. The next prime is 242501533. The reversal of 242501531 is 135105242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242501531 - 2² = 242501527 is a prime.

It is a super-2 number, since 2×242501531² = 117613985074687922, which contains 22 as substring.

Together with 242501533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 242501497 and 242501506.

It is not a weakly prime, because it can be changed into another prime (242501533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121250765 + 121250766.

It is an arithmetic number, because the mean of its divisors is an integer number (121250766).

Almost surely, 2^242501531 is an apocalyptic number.

242501531 is a deficient number, since it is larger than the sum of its proper divisors (1).

242501531 is an equidigital number, since it uses as much as digits as its factorization.

242501531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 242501531 is about 15572.4606597673. The cubic root of 242501531 is about 623.5981645760.

Adding to 242501531 its reverse (135105242), we get a palindrome (377606773).

The spelling of 242501531 in words is "two hundred forty-two million, five hundred one thousand, five hundred thirty-one".