1549428133381 has 2 divisors, whose sum is σ = 1549428133382. Its totient is φ = 1549428133380.

The previous prime is 1549428133301. The next prime is 1549428133423. The reversal of 1549428133381 is 1833318249451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815347597156 + 734080536225 = 902966^2 + 856785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1549428133381 - 2²³ = 1549419744773 is a prime.

It is a super-2 number, since 2×1549428133381² (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 (1549428133301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774714066690 + 774714066691.

It is an arithmetic number, because the mean of its divisors is an integer number (774714066691).

Almost surely, 2^{1549428133381} is an apocalyptic number.

It is an amenable number.

1549428133381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1549428133381 is an equidigital number, since it uses as much as digits as its factorization.

1549428133381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 52.

The spelling of 1549428133381 in words is "one trillion, five hundred forty-nine billion, four hundred twenty-eight million, one hundred thirty-three thousand, three hundred eighty-one".