1376551161 has 12 divisors (see below), whose sum is σ = 1990050660. Its totient is φ = 916916640.

The previous prime is 1376551157. The next prime is 1376551199. The reversal of 1376551161 is 1611556731.

1376551161 is a `hidden beast` number, since 13 + 76 + 5 + 511 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1221921936 + 154629225 = 34956^2 + 12435^2 .

It is not a de Polignac number, because 1376551161 - 2² = 1376551157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1376551061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54126 + ... + 75383.

It is an arithmetic number, because the mean of its divisors is an integer number (165837555).

Almost surely, 2^1376551161 is an apocalyptic number.

It is an amenable number.

1376551161 is a deficient number, since it is larger than the sum of its proper divisors (613499499).

1376551161 is a wasteful number, since it uses less digits than its factorization.

1376551161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130696 (or 130693 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 1376551161 is about 37101.9023905783. The cubic root of 1376551161 is about 1112.4080398001.

The spelling of 1376551161 in words is "one billion, three hundred seventy-six million, five hundred fifty-one thousand, one hundred sixty-one".