243042155401 has 2 divisors, whose sum is σ = 243042155402. Its totient is φ = 243042155400.

The previous prime is 243042155371. The next prime is 243042155437. The reversal of 243042155401 is 104551240342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231996355600 + 11045799801 = 481660^2 + 105099^2 .

It is a cyclic number.

It is not a de Polignac number, because 243042155401 - 2¹⁹ = 243041631113 is a prime.

It is not a weakly prime, because it can be changed into another prime (243042155441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121521077700 + 121521077701.

It is an arithmetic number, because the mean of its divisors is an integer number (121521077701).

Almost surely, 2^243042155401 is an apocalyptic number.

It is an amenable number.

243042155401 is a deficient number, since it is larger than the sum of its proper divisors (1).

243042155401 is an equidigital number, since it uses as much as digits as its factorization.

243042155401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 243042155401 its reverse (104551240342), we get a palindrome (347593395743).

The spelling of 243042155401 in words is "two hundred forty-three billion, forty-two million, one hundred fifty-five thousand, four hundred one".