242515831 has 2 divisors, whose sum is σ = 242515832. Its totient is φ = 242515830.

The previous prime is 242515799. The next prime is 242515837. The reversal of 242515831 is 138515242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242515831 - 2⁵ = 242515799 is a prime.

It is a super-2 number, since 2×242515831² = 117627856571241122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 242515793 and 242515802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242515837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121257915 + 121257916.

It is an arithmetic number, because the mean of its divisors is an integer number (121257916).

Almost surely, 2^242515831 is an apocalyptic number.

242515831 is a deficient number, since it is larger than the sum of its proper divisors (1).

242515831 is an equidigital number, since it uses as much as digits as its factorization.

242515831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 31.

The square root of 242515831 is about 15572.9197968782. The cubic root of 242515831 is about 623.6104219261.

The spelling of 242515831 in words is "two hundred forty-two million, five hundred fifteen thousand, eight hundred thirty-one".