242693531 has 2 divisors, whose sum is σ = 242693532. Its totient is φ = 242693530.

The previous prime is 242693509. The next prime is 242693533. The reversal of 242693531 is 135396242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242693531 - 2¹⁰ = 242692507 is a prime.

It is a super-2 number, since 2×242693531² = 117800299978495922, which contains 22 as substring.

Together with 242693533, 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 = 242693491 and 242693500.

It is not a weakly prime, because it can be changed into another prime (242693533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121346765 + 121346766.

It is an arithmetic number, because the mean of its divisors is an integer number (121346766).

Almost surely, 2^242693531 is an apocalyptic number.

242693531 is a deficient number, since it is larger than the sum of its proper divisors (1).

242693531 is an equidigital number, since it uses as much as digits as its factorization.

242693531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The square root of 242693531 is about 15578.6241690337. The cubic root of 242693531 is about 623.7626986061.

Subtracting from 242693531 its sum of digits (35), we obtain a triangular number (242693496 = T₂₂₀₃₁).

The spelling of 242693531 in words is "two hundred forty-two million, six hundred ninety-three thousand, five hundred thirty-one".