1377200813 has 4 divisors (see below), whose sum is σ = 1403185788. Its totient is φ = 1351215840.

The previous prime is 1377200809. The next prime is 1377200837. The reversal of 1377200813 is 3180027731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 736199689 + 641001124 = 27133^2 + 25318^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377200813 - 2² = 1377200809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1377200813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377200873) 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, 12992408 + ... + 12992513.

It is an arithmetic number, because the mean of its divisors is an integer number (350796447).

Almost surely, 2^1377200813 is an apocalyptic number.

It is an amenable number.

1377200813 is a deficient number, since it is larger than the sum of its proper divisors (25984975).

1377200813 is an equidigital number, since it uses as much as digits as its factorization.

1377200813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25984974.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 1377200813 is about 37110.6563267210. The cubic root of 1377200813 is about 1112.5830095532.

The spelling of 1377200813 in words is "one billion, three hundred seventy-seven million, two hundred thousand, eight hundred thirteen".