1377021137 has 4 divisors (see below), whose sum is σ = 1399595316. Its totient is φ = 1354446960.

The previous prime is 1377021133. The next prime is 1377021167. The reversal of 1377021137 is 7311207731.

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 799532176 + 577488961 = 28276^2 + 24031^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377021137 - 2² = 1377021133 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1377021133) 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, 11286998 + ... + 11287119.

It is an arithmetic number, because the mean of its divisors is an integer number (349898829).

Almost surely, 2^1377021137 is an apocalyptic number.

It is an amenable number.

1377021137 is a deficient number, since it is larger than the sum of its proper divisors (22574179).

1377021137 is an equidigital number, since it uses as much as digits as its factorization.

1377021137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22574178.

The product of its (nonzero) digits is 6174, while the sum is 32.

The square root of 1377021137 is about 37108.2354336608. The cubic root of 1377021137 is about 1112.5346232039.

Adding to 1377021137 its reverse (7311207731), we get a palindrome (8688228868).

The spelling of 1377021137 in words is "one billion, three hundred seventy-seven million, twenty-one thousand, one hundred thirty-seven".