242915251 has 2 divisors, whose sum is σ = 242915252. Its totient is φ = 242915250.

The previous prime is 242915221. The next prime is 242915291. The reversal of 242915251 is 152519242.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 242915251 - 2¹³ = 242907059 is a prime.

It is not a weakly prime, because it can be changed into another prime (242915221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121457625 + 121457626.

It is an arithmetic number, because the mean of its divisors is an integer number (121457626).

Almost surely, 2^242915251 is an apocalyptic number.

242915251 is a deficient number, since it is larger than the sum of its proper divisors (1).

242915251 is an equidigital number, since it uses as much as digits as its factorization.

242915251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 242915251 is about 15585.7387056244. The cubic root of 242915251 is about 623.9525932029.

The spelling of 242915251 in words is "two hundred forty-two million, nine hundred fifteen thousand, two hundred fifty-one".