1970383721 has 2 divisors, whose sum is σ = 1970383722. Its totient is φ = 1970383720.

The previous prime is 1970383697. The next prime is 1970383741. The reversal of 1970383721 is 1273830791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1970383321 + 400 = 44389^2 + 20^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1970383721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1970383741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985191860 + 985191861.

It is an arithmetic number, because the mean of its divisors is an integer number (985191861).

Almost surely, 2^1970383721 is an apocalyptic number.

It is an amenable number.

1970383721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1970383721 is an equidigital number, since it uses as much as digits as its factorization.

1970383721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 1970383721 is about 44389.0045056205. The cubic root of 1970383721 is about 1253.6710685302.

The spelling of 1970383721 in words is "one billion, nine hundred seventy million, three hundred eighty-three thousand, seven hundred twenty-one".