1377137161 has 4 divisors (see below), whose sum is σ = 1382256900. Its totient is φ = 1372017424.

The previous prime is 1377137137. The next prime is 1377137171. The reversal of 1377137161 is 1617317731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1617317731 = 4397 ⋅367823.

It can be written as a sum of positive squares in 2 ways, for example, as 161290000 + 1215847161 = 12700^2 + 34869^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377137161 - 2⁵ = 1377137129 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 1377137161.

It is not an unprimeable number, because it can be changed into a prime (1377137131) 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, 2559466 + ... + 2560003.

It is an arithmetic number, because the mean of its divisors is an integer number (345564225).

Almost surely, 2^1377137161 is an apocalyptic number.

It is an amenable number.

1377137161 is a deficient number, since it is larger than the sum of its proper divisors (5119739).

1377137161 is an equidigital number, since it uses as much as digits as its factorization.

1377137161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5119738.

The product of its digits is 18522, while the sum is 37.

The square root of 1377137161 is about 37109.7987194757. The cubic root of 1377137161 is about 1112.5658686918.

The spelling of 1377137161 in words is "one billion, three hundred seventy-seven million, one hundred thirty-seven thousand, one hundred sixty-one".