242661919 has 2 divisors, whose sum is σ = 242661920. Its totient is φ = 242661918.

The previous prime is 242661907. The next prime is 242661929. The reversal of 242661919 is 919166242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242661919 - 2¹³ = 242653727 is a prime.

It is a super-2 number, since 2×242661919² = 117769613865525122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242661929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121330959 + 121330960.

It is an arithmetic number, because the mean of its divisors is an integer number (121330960).

Almost surely, 2^242661919 is an apocalyptic number.

242661919 is a deficient number, since it is larger than the sum of its proper divisors (1).

242661919 is an equidigital number, since it uses as much as digits as its factorization.

242661919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 242661919 is about 15577.6095406195. The cubic root of 242661919 is about 623.7356147327.

The spelling of 242661919 in words is "two hundred forty-two million, six hundred sixty-one thousand, nine hundred nineteen".