1947368641 has 3 divisors (see below), whose sum is σ = 1947412771. Its totient is φ = 1947324512.

The previous prime is 1947368639. The next prime is 1947368651. The reversal of 1947368641 is 1468637491.

The square root of 1947368641 is 44129.

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

1947368641 is nontrivially palindromic in base 14.

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.

It can be written as a sum of positive squares in only one way, i.e., 4322241 + 1943046400 = 2079^2 + 44080^2 .

It is not a de Polignac number, because 1947368641 - 2¹ = 1947368639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1947368611) 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, 22065 + ... + 66193.

Almost surely, 2^1947368641 is an apocalyptic number.

1947368641 is the 44129-th square number.

1947368641 is the 22065-th centered octagonal number.

It is an amenable number.

1947368641 is a deficient number, since it is larger than the sum of its proper divisors (44130).

1947368641 is an frugal number, since it uses more digits than its factorization.

1947368641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88258 (or 44129 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The cubic root of 1947368641 is about 1248.7707683345.

Multiplying 1947368641 by its sum of digits (49), we get a square (95421063409 = 308903²).

The spelling of 1947368641 in words is "one billion, nine hundred forty-seven million, three hundred sixty-eight thousand, six hundred forty-one".