3857779159129 has 9 divisors (see below), whose sum is σ = 4487636648127. Its totient is φ = 3306656065944.

The previous prime is 3857779159121. The next prime is 3857779159139. The reversal of 3857779159129 is 9219519777583.

The square root of 3857779159129 is 1964123.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1186188909129 + 2671590250000 = 1089123^2 + 1634500^2 .

It is not a de Polignac number, because 3857779159129 - 2³ = 3857779159121 is a prime.

It is a super-2 number, since 2×3857779159129² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3857779159121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13608567 + ... + 13889155.

Almost surely, 2^{3857779159129} is an apocalyptic number.

3857779159129 is the 1964123-rd square number.

3857779159129 is the 982062-nd centered octagonal number.

It is an amenable number.

3857779159129 is a deficient number, since it is larger than the sum of its proper divisors (629857488998).

3857779159129 is an frugal number, since it uses more digits than its factorization.

3857779159129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561192 (or 280596 counting only the distinct ones).

The product of its digits is 300056400, while the sum is 73.

The spelling of 3857779159129 in words is "three trillion, eight hundred fifty-seven billion, seven hundred seventy-nine million, one hundred fifty-nine thousand, one hundred twenty-nine".