1377534721 has 2 divisors, whose sum is σ = 1377534722. Its totient is φ = 1377534720.

The previous prime is 1377534707. The next prime is 1377534787. The reversal of 1377534721 is 1274357731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1357185600 + 20349121 = 36840^2 + 4511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377534721 - 2²⁵ = 1343980289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1377534121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688767360 + 688767361.

It is an arithmetic number, because the mean of its divisors is an integer number (688767361).

Almost surely, 2^1377534721 is an apocalyptic number.

It is an amenable number.

1377534721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377534721 is an equidigital number, since it uses as much as digits as its factorization.

1377534721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123480, while the sum is 40.

The square root of 1377534721 is about 37115.1548696755. The cubic root of 1377534721 is about 1112.6729190625.

The spelling of 1377534721 in words is "one billion, three hundred seventy-seven million, five hundred thirty-four thousand, seven hundred twenty-one".