1377256613 has 2 divisors, whose sum is σ = 1377256614. Its totient is φ = 1377256612.

The previous prime is 1377256511. The next prime is 1377256631. The reversal of 1377256613 is 3166527731.

It is a happy number.

Together with next prime (1377256631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1320450244 + 56806369 = 36338^2 + 7537^2 .

It is an emirp because it is prime and its reverse (3166527731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1377256613 - 2¹⁰ = 1377255589 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1377256213) 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, 688628306 + 688628307.

It is an arithmetic number, because the mean of its divisors is an integer number (688628307).

Almost surely, 2^1377256613 is an apocalyptic number.

It is an amenable number.

1377256613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377256613 is an equidigital number, since it uses as much as digits as its factorization.

1377256613 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 1377256613 is about 37111.4081247263. The cubic root of 1377256613 is about 1112.5980355134.

The spelling of 1377256613 in words is "one billion, three hundred seventy-seven million, two hundred fifty-six thousand, six hundred thirteen".