1073761721 has 2 divisors, whose sum is σ = 1073761722. Its totient is φ = 1073761720.

The previous prime is 1073761697. The next prime is 1073761727. The reversal of 1073761721 is 1271673701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 689797696 + 383964025 = 26264^2 + 19595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1073761721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1073761727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536880860 + 536880861.

It is an arithmetic number, because the mean of its divisors is an integer number (536880861).

Almost surely, 2^1073761721 is an apocalyptic number.

It is an amenable number.

1073761721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1073761721 is an equidigital number, since it uses as much as digits as its factorization.

1073761721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 1073761721 is about 32768.3036027195. The cubic root of 1073761721 is about 1024.0063250469.

The spelling of 1073761721 in words is "one billion, seventy-three million, seven hundred sixty-one thousand, seven hundred twenty-one".