243172451 has 2 divisors, whose sum is σ = 243172452. Its totient is φ = 243172450.

The previous prime is 243172441. The next prime is 243172459. The reversal of 243172451 is 154271342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243172451 is a prime.

It is not a weakly prime, because it can be changed into another prime (243172459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121586225 + 121586226.

It is an arithmetic number, because the mean of its divisors is an integer number (121586226).

Almost surely, 2^243172451 is an apocalyptic number.

243172451 is a deficient number, since it is larger than the sum of its proper divisors (1).

243172451 is an equidigital number, since it uses as much as digits as its factorization.

243172451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 29.

The square root of 243172451 is about 15593.9876555036. The cubic root of 243172451 is about 624.1727303363.

The spelling of 243172451 in words is "two hundred forty-three million, one hundred seventy-two thousand, four hundred fifty-one".