243381497 has 2 divisors, whose sum is σ = 243381498. Its totient is φ = 243381496.

The previous prime is 243381493. The next prime is 243381499. The reversal of 243381497 is 794183342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207907561 + 35473936 = 14419^2 + 5956^2 .

It is a cyclic number.

It is not a de Polignac number, because 243381497 - 2² = 243381493 is a prime.

It is a super-2 number, since 2×243381497² = 118469106163922018, which contains 22 as substring.

Together with 243381499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243381493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121690748 + 121690749.

It is an arithmetic number, because the mean of its divisors is an integer number (121690749).

Almost surely, 2^243381497 is an apocalyptic number.

It is an amenable number.

243381497 is a deficient number, since it is larger than the sum of its proper divisors (1).

243381497 is an equidigital number, since it uses as much as digits as its factorization.

243381497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 243381497 is about 15600.6889911952. The cubic root of 243381497 is about 624.3515382017.

The spelling of 243381497 in words is "two hundred forty-three million, three hundred eighty-one thousand, four hundred ninety-seven".