1933954721 has 2 divisors, whose sum is σ = 1933954722. Its totient is φ = 1933954720.

The previous prime is 1933954679. The next prime is 1933954723. The reversal of 1933954721 is 1274593391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1666272400 + 267682321 = 40820^2 + 16361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1933954721 is a prime.

Together with 1933954723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1933954723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 966977360 + 966977361.

It is an arithmetic number, because the mean of its divisors is an integer number (966977361).

Almost surely, 2^1933954721 is an apocalyptic number.

It is an amenable number.

1933954721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1933954721 is an equidigital number, since it uses as much as digits as its factorization.

1933954721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 44.

The square root of 1933954721 is about 43976.7520515101. The cubic root of 1933954721 is about 1245.8968867862.

The spelling of 1933954721 in words is "one billion, nine hundred thirty-three million, nine hundred fifty-four thousand, seven hundred twenty-one".