7312919386081 has 9 divisors (see below), whose sum is σ = 7768444169721. Its totient is φ = 6882704389632.

The previous prime is 7312919386063. The next prime is 7312919386111. The reversal of 7312919386081 is 1806839192137.

The square root of 7312919386081 is 2704241.

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

It can be written as a sum of positive squares in 4 ways, for example, as 3311639283681 + 4001280102400 = 1819791^2 + 2000320^2 .

It is not a de Polignac number, because 7312919386081 - 2¹⁷ = 7312919255009 is a prime.

It is a super-2 number, since 2×7312919386081² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7312919386181) 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, 45892561 + ... + 46051633.

Almost surely, 2^{7312919386081} is an apocalyptic number.

7312919386081 is the 2704241-st square number.

7312919386081 is the 1352121-st centered octagonal number.

It is an amenable number.

7312919386081 is a deficient number, since it is larger than the sum of its proper divisors (455524783640).

7312919386081 is an frugal number, since it uses more digits than its factorization.

7312919386081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318180 (or 159090 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 58.

The spelling of 7312919386081 in words is "seven trillion, three hundred twelve billion, nine hundred nineteen million, three hundred eighty-six thousand, eighty-one".