1377947609 has 2 divisors, whose sum is σ = 1377947610. Its totient is φ = 1377947608.

The previous prime is 1377947579. The next prime is 1377947617. The reversal of 1377947609 is 9067497731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1375297225 + 2650384 = 37085^2 + 1628^2 .

It is an emirp because it is prime and its reverse (9067497731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1377947609 - 2⁸ = 1377947353 is a prime.

It is a super-2 number, since 2×1377947609² = 3797479226297633762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1377947629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688973804 + 688973805.

It is an arithmetic number, because the mean of its divisors is an integer number (688973805).

Almost surely, 2^1377947609 is an apocalyptic number.

It is an amenable number.

1377947609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377947609 is an equidigital number, since it uses as much as digits as its factorization.

1377947609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000376, while the sum is 53.

The square root of 1377947609 is about 37120.7167091370. The cubic root of 1377947609 is about 1112.7840749792.

The spelling of 1377947609 in words is "one billion, three hundred seventy-seven million, nine hundred forty-seven thousand, six hundred nine".