139471624681 has 3 divisors (see below), whose sum is σ = 139471998141. Its totient is φ = 139471251222.

The previous prime is 139471624667. The next prime is 139471624711. The reversal of 139471624681 is 186426174931.

The square root of 139471624681 is 373459.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 186426174931 = 10289 ⋅18118979.

It is not a de Polignac number, because 139471624681 - 2³³ = 130881690089 is a prime.

It is a super-2 number, since 2×139471624681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139471624661) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 186730 + ... + 560188.

It is an arithmetic number, because the mean of its divisors is an integer number (46490666047).

Almost surely, 2^139471624681 is an apocalyptic number.

139471624681 is the 373459-th square number.

139471624681 is the 186730-th centered octagonal number.

It is an amenable number.

139471624681 is a deficient number, since it is larger than the sum of its proper divisors (373460).

139471624681 is an frugal number, since it uses more digits than its factorization.

139471624681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746918 (or 373459 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 52.

The spelling of 139471624681 in words is "one hundred thirty-nine billion, four hundred seventy-one million, six hundred twenty-four thousand, six hundred eighty-one".