1377261563 has 2 divisors, whose sum is σ = 1377261564. Its totient is φ = 1377261562.

The previous prime is 1377261469. The next prime is 1377261617. The reversal of 1377261563 is 3651627731.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1377261563 - 2¹⁸ = 1376999419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1377261563.

It is not a weakly prime, because it can be changed into another prime (1377261863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688630781 + 688630782.

It is an arithmetic number, because the mean of its divisors is an integer number (688630782).

Almost surely, 2^1377261563 is an apocalyptic number.

1377261563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377261563 is an equidigital number, since it uses as much as digits as its factorization.

1377261563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 41.

The square root of 1377261563 is about 37111.4748157494. The cubic root of 1377261563 is about 1112.5993684418.

The spelling of 1377261563 in words is "one billion, three hundred seventy-seven million, two hundred sixty-one thousand, five hundred sixty-three".