242994551 has 2 divisors, whose sum is σ = 242994552. Its totient is φ = 242994550.

The previous prime is 242994511. The next prime is 242994607. The reversal of 242994551 is 155499242.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242994551 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 242994499 and 242994508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242994511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121497275 + 121497276.

It is an arithmetic number, because the mean of its divisors is an integer number (121497276).

Almost surely, 2^242994551 is an apocalyptic number.

242994551 is a deficient number, since it is larger than the sum of its proper divisors (1).

242994551 is an equidigital number, since it uses as much as digits as its factorization.

242994551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 242994551 is about 15588.2824903836. The cubic root of 242994551 is about 624.0204825281.

The spelling of 242994551 in words is "two hundred forty-two million, nine hundred ninety-four thousand, five hundred fifty-one".