1936722721 has 2 divisors, whose sum is σ = 1936722722. Its totient is φ = 1936722720.

The previous prime is 1936722679. The next prime is 1936722727. The reversal of 1936722721 is 1272276391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1716942096 + 219780625 = 41436^2 + 14825^2 .

It is a cyclic number.

It is not a de Polignac number, because 1936722721 - 2¹⁷ = 1936591649 is a prime.

It is a super-3 number, since 3×1936722721³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1936722727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 968361360 + 968361361.

It is an arithmetic number, because the mean of its divisors is an integer number (968361361).

Almost surely, 2^1936722721 is an apocalyptic number.

It is an amenable number.

1936722721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1936722721 is an equidigital number, since it uses as much as digits as its factorization.

1936722721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 1936722721 is about 44008.2119723126. The cubic root of 1936722721 is about 1246.4910059325.

The spelling of 1936722721 in words is "one billion, nine hundred thirty-six million, seven hundred twenty-two thousand, seven hundred twenty-one".