1377463561 has 2 divisors, whose sum is σ = 1377463562. Its totient is φ = 1377463560.

The previous prime is 1377463543. The next prime is 1377463589. The reversal of 1377463561 is 1653647731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 850072336 + 527391225 = 29156^2 + 22965^2 .

It is an emirp because it is prime and its reverse (1653647731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1377463561 - 2⁷ = 1377463433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1377463361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688731780 + 688731781.

It is an arithmetic number, because the mean of its divisors is an integer number (688731781).

Almost surely, 2^1377463561 is an apocalyptic number.

It is an amenable number.

1377463561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377463561 is an equidigital number, since it uses as much as digits as its factorization.

1377463561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 43.

The square root of 1377463561 is about 37114.1962192366. The cubic root of 1377463561 is about 1112.6537594321.

The spelling of 1377463561 in words is "one billion, three hundred seventy-seven million, four hundred sixty-three thousand, five hundred sixty-one".