1238507557381 has 2 divisors, whose sum is σ = 1238507557382. Its totient is φ = 1238507557380.

The previous prime is 1238507557369. The next prime is 1238507557451. The reversal of 1238507557381 is 1837557058321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1114219580356 + 124287977025 = 1055566^2 + 352545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238507557381 - 2¹³ = 1238507549189 is a prime.

It is a super-2 number, since 2×1238507557381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1238507557481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619253778690 + 619253778691.

It is an arithmetic number, because the mean of its divisors is an integer number (619253778691).

Almost surely, 2^{1238507557381} is an apocalyptic number.

It is an amenable number.

1238507557381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238507557381 is an equidigital number, since it uses as much as digits as its factorization.

1238507557381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056000, while the sum is 55.

The spelling of 1238507557381 in words is "one trillion, two hundred thirty-eight billion, five hundred seven million, five hundred fifty-seven thousand, three hundred eighty-one".