1300719721081 has 9 divisors (see below), whose sum is σ = 1429730507919. Its totient is φ = 1182461068800.

The previous prime is 1300719721057. The next prime is 1300719721087. The reversal of 1300719721081 is 1801279170031.

The square root of 1300719721081 is 1140491.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 341417007481 + 959302713600 = 584309^2 + 979440^2 .

It is not a de Polignac number, because 1300719721081 - 2⁷ = 1300719720953 is a prime.

It is a super-2 number, since 2×1300719721081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1300719721087) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12493561 + ... + 12597241.

Almost surely, 2^{1300719721081} is an apocalyptic number.

1300719721081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1300719721081 is the 1140491-st square number.

1300719721081 is the 570246-th centered octagonal number.

It is an amenable number.

1300719721081 is a deficient number, since it is larger than the sum of its proper divisors (129010786838).

1300719721081 is an frugal number, since it uses more digits than its factorization.

1300719721081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207384 (or 103692 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 40.

The spelling of 1300719721081 in words is "one trillion, three hundred billion, seven hundred nineteen million, seven hundred twenty-one thousand, eighty-one".