238121428549 has 2 divisors, whose sum is σ = 238121428550. Its totient is φ = 238121428548.

The previous prime is 238121428537. The next prime is 238121428577. The reversal of 238121428549 is 945824121832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229937512324 + 8183916225 = 479518^2 + 90465^2 .

It is a cyclic number.

It is not a de Polignac number, because 238121428549 - 2⁹ = 238121428037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238121428949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119060714274 + 119060714275.

It is an arithmetic number, because the mean of its divisors is an integer number (119060714275).

Almost surely, 2^238121428549 is an apocalyptic number.

It is an amenable number.

238121428549 is a deficient number, since it is larger than the sum of its proper divisors (1).

238121428549 is an equidigital number, since it uses as much as digits as its factorization.

238121428549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1105920, while the sum is 49.

The spelling of 238121428549 in words is "two hundred thirty-eight billion, one hundred twenty-one million, four hundred twenty-eight thousand, five hundred forty-nine".