1937494179721 has 9 divisors (see below), whose sum is σ = 1974815612679. Its totient is φ = 1900865304936.

The previous prime is 1937494179679. The next prime is 1937494179727. The reversal of 1937494179721 is 1279714947391.

The square root of 1937494179721 is 1391939.

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., 1396733967225 + 540760212496 = 1181835^2 + 735364^2 .

It is not a de Polignac number, because 1937494179721 - 2²³ = 1937485791113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1937494179727) 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, 73759636 + ... + 73785898.

Almost surely, 2^{1937494179721} is an apocalyptic number.

1937494179721 is the 1391939-th square number.

1937494179721 is the 695970-th centered octagonal number.

It is an amenable number.

1937494179721 is a deficient number, since it is larger than the sum of its proper divisors (37321432958).

1937494179721 is an frugal number, since it uses more digits than its factorization.

1937494179721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52632 (or 26316 counting only the distinct ones).

The product of its digits is 24004512, while the sum is 64.

Multiplying 1937494179721 by its sum of digits (64), we get a square (123999627502144 = 11135512²).

The spelling of 1937494179721 in words is "one trillion, nine hundred thirty-seven billion, four hundred ninety-four million, one hundred seventy-nine thousand, seven hundred twenty-one".