242651531 has 2 divisors, whose sum is σ = 242651532. Its totient is φ = 242651530.

The previous prime is 242651467. The next prime is 242651551. The reversal of 242651531 is 135156242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242651531 - 2⁶ = 242651467 is a prime.

It is a super-2 number, since 2×242651531² = 117759530993287922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 242651494 and 242651503.

It is not a weakly prime, because it can be changed into another prime (242651551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121325765 + 121325766.

It is an arithmetic number, because the mean of its divisors is an integer number (121325766).

Almost surely, 2^242651531 is an apocalyptic number.

242651531 is a deficient number, since it is larger than the sum of its proper divisors (1).

242651531 is an equidigital number, since it uses as much as digits as its factorization.

242651531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 29.

The square root of 242651531 is about 15577.2761097696. The cubic root of 242651531 is about 623.7267142041.

The spelling of 242651531 in words is "two hundred forty-two million, six hundred fifty-one thousand, five hundred thirty-one".