1378687133 has 2 divisors, whose sum is σ = 1378687134. Its totient is φ = 1378687132.

The previous prime is 1378687127. The next prime is 1378687151. The reversal of 1378687133 is 3317868731.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1308847684 + 69839449 = 36178^2 + 8357^2 .

It is an emirp because it is prime and its reverse (3317868731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1378687133 - 2²⁰ = 1377638557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378687103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689343566 + 689343567.

It is an arithmetic number, because the mean of its divisors is an integer number (689343567).

Almost surely, 2^1378687133 is an apocalyptic number.

It is an amenable number.

1378687133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378687133 is an equidigital number, since it uses as much as digits as its factorization.

1378687133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 47.

The square root of 1378687133 is about 37130.6764414547. The cubic root of 1378687133 is about 1112.9831109345.

The spelling of 1378687133 in words is "one billion, three hundred seventy-eight million, six hundred eighty-seven thousand, one hundred thirty-three".