938687761881 has 45 divisors (see below), whose sum is σ = 1420430411631. Its totient is φ = 617775501888.

The previous prime is 938687761867. The next prime is 938687761919. The reversal of 938687761881 is 188167786839.

The square root of 938687761881 is 968859.

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., 935795043225 + 2892718656 = 967365^2 + 53784^2 .

It is not a de Polignac number, because 938687761881 - 2⁹ = 938687761369 is a prime.

It is a super-2 number, since 2×938687761881² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (930687761881) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 723737025 + ... + 723738321.

Almost surely, 2^938687761881 is an apocalyptic number.

938687761881 is the 968859-th square number.

938687761881 is the 484430-th centered octagonal number.

It is an amenable number.

938687761881 is a deficient number, since it is larger than the sum of its proper divisors (481742649750).

938687761881 is an frugal number, since it uses more digits than its factorization.

938687761881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2772 (or 1383 counting only the distinct ones).

The product of its digits is 195084288, while the sum is 72.

The spelling of 938687761881 in words is "nine hundred thirty-eight billion, six hundred eighty-seven million, seven hundred sixty-one thousand, eight hundred eighty-one".