2139026176681 has 9 divisors (see below), whose sum is σ = 2148588242661. Its totient is φ = 2129506497312.

The previous prime is 2139026176607. The next prime is 2139026176687. The reversal of 2139026176681 is 1866716209312.

The square root of 2139026176681 is 1462541.

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

It can be written as a sum of positive squares in 4 ways, for example, as 206425744281 + 1932600432400 = 454341^2 + 1390180^2 .

It is not a de Polignac number, because 2139026176681 - 2²⁷ = 2138891958953 is a prime.

It is a super-2 number, since 2×2139026176681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139026176687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 340768915 + ... + 340775191.

Almost surely, 2^{2139026176681} is an apocalyptic number.

2139026176681 is the 1462541-st square number.

2139026176681 is the 731271-st centered octagonal number.

It is an amenable number.

2139026176681 is a deficient number, since it is larger than the sum of its proper divisors (9562065980).

2139026176681 is an frugal number, since it uses more digits than its factorization.

2139026176681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13020 (or 6510 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 2139026176681 in words is "two trillion, one hundred thirty-nine billion, twenty-six million, one hundred seventy-six thousand, six hundred eighty-one".