2731520003561 has 2 divisors, whose sum is σ = 2731520003562. Its totient is φ = 2731520003560.

The previous prime is 2731520003549. The next prime is 2731520003581. The reversal of 2731520003561 is 1653000251372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2197305193561 + 534214810000 = 1482331^2 + 730900^2 .

It is a cyclic number.

It is not a de Polignac number, because 2731520003561 - 2¹⁸ = 2731519741417 is a prime.

It is a super-2 number, since 2×2731520003561² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2731520003581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365760001780 + 1365760001781.

It is an arithmetic number, because the mean of its divisors is an integer number (1365760001781).

Almost surely, 2^{2731520003561} is an apocalyptic number.

It is an amenable number.

2731520003561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2731520003561 is an equidigital number, since it uses as much as digits as its factorization.

2731520003561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 2731520003561 in words is "two trillion, seven hundred thirty-one billion, five hundred twenty million, three thousand, five hundred sixty-one".