1941371721 has 27 divisors (see below), whose sum is σ = 2963394759. Its totient is φ = 1224543312.

The previous prime is 1941371713. The next prime is 1941371723. The reversal of 1941371721 is 1271731491.

The square root of 1941371721 is 44061.

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., 123543225 + 1817828496 = 11115^2 + 42636^2 .

It is not a de Polignac number, because 1941371721 - 2³ = 1941371713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1941371723) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2511091 + ... + 2511863.

Almost surely, 2^1941371721 is an apocalyptic number.

1941371721 is the 44061-st square number.

1941371721 is the 22031-st centered octagonal number.

It is an amenable number.

1941371721 is a deficient number, since it is larger than the sum of its proper divisors (1022023038).

1941371721 is an frugal number, since it uses more digits than its factorization.

1941371721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 795 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The cubic root of 1941371721 is about 1247.4875874230.

Multiplying 1941371721 by its sum of digits (36), we get a square (69889381956 = 264366²).

The spelling of 1941371721 in words is "one billion, nine hundred forty-one million, three hundred seventy-one thousand, seven hundred twenty-one".