2987813561 has 2 divisors, whose sum is σ = 2987813562. Its totient is φ = 2987813560.

The previous prime is 2987813539. The next prime is 2987813567. The reversal of 2987813561 is 1653187892.

2987813561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1889553961 + 1098259600 = 43469^2 + 33140^2 .

It is a cyclic number.

It is not a de Polignac number, because 2987813561 - 2¹⁰ = 2987812537 is a prime.

It is not a weakly prime, because it can be changed into another prime (2987813567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1493906780 + 1493906781.

It is an arithmetic number, because the mean of its divisors is an integer number (1493906781).

Almost surely, 2^2987813561 is an apocalyptic number.

It is an amenable number.

2987813561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2987813561 is an equidigital number, since it uses as much as digits as its factorization.

2987813561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 50.

The square root of 2987813561 is about 54660.8960866907. The cubic root of 2987813561 is about 1440.2940437661.

The spelling of 2987813561 in words is "two billion, nine hundred eighty-seven million, eight hundred thirteen thousand, five hundred sixty-one".