1377800609 has 4 divisors (see below), whose sum is σ = 1377878016. Its totient is φ = 1377723204.

The previous prime is 1377800603. The next prime is 1377800621. The reversal of 1377800609 is 9060087731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1377800609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1377800603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2912 + ... + 52574.

It is an arithmetic number, because the mean of its divisors is an integer number (344469504).

Almost surely, 2^1377800609 is an apocalyptic number.

It is an amenable number.

1377800609 is a deficient number, since it is larger than the sum of its proper divisors (77407).

1377800609 is an equidigital number, since it uses as much as digits as its factorization.

1377800609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77406.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 1377800609 is about 37118.7366299016. The cubic root of 1377800609 is about 1112.7445028225.

The spelling of 1377800609 in words is "one billion, three hundred seventy-seven million, eight hundred thousand, six hundred nine".