1377778133 has 4 divisors (see below), whose sum is σ = 1378360140. Its totient is φ = 1377196128.

The previous prime is 1377778097. The next prime is 1377778153. The reversal of 1377778133 is 3318777731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 971070244 + 406707889 = 31162^2 + 20167^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377778133 - 2¹⁰ = 1377777109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377778153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287438 + ... + 292191.

It is an arithmetic number, because the mean of its divisors is an integer number (344590035).

Almost surely, 2^1377778133 is an apocalyptic number.

It is an amenable number.

1377778133 is a deficient number, since it is larger than the sum of its proper divisors (582007).

1377778133 is an equidigital number, since it uses as much as digits as its factorization.

1377778133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582006.

The product of its digits is 518616, while the sum is 47.

The square root of 1377778133 is about 37118.4338705178. The cubic root of 1377778133 is about 1112.7384520724.

The spelling of 1377778133 in words is "one billion, three hundred seventy-seven million, seven hundred seventy-eight thousand, one hundred thirty-three".