1952791721 has 2 divisors, whose sum is σ = 1952791722. Its totient is φ = 1952791720.

The previous prime is 1952791699. The next prime is 1952791733. The reversal of 1952791721 is 1271972591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1633776400 + 319015321 = 40420^2 + 17861^2 .

It is an emirp because it is prime and its reverse (1271972591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1952791721 - 2⁶ = 1952791657 is a prime.

It is a super-2 number, since 2×1952791721² = 7626791011212283682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1952701721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 976395860 + 976395861.

It is an arithmetic number, because the mean of its divisors is an integer number (976395861).

Almost surely, 2^1952791721 is an apocalyptic number.

It is an amenable number.

1952791721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1952791721 is an equidigital number, since it uses as much as digits as its factorization.

1952791721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 44.

The square root of 1952791721 is about 44190.4030418370. The cubic root of 1952791721 is about 1249.9288964355.

The spelling of 1952791721 in words is "one billion, nine hundred fifty-two million, seven hundred ninety-one thousand, seven hundred twenty-one".