2187077561 has 2 divisors, whose sum is σ = 2187077562. Its totient is φ = 2187077560.

The previous prime is 2187077537. The next prime is 2187077573. The reversal of 2187077561 is 1657707812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1740558400 + 446519161 = 41720^2 + 21131^2 .

It is a cyclic number.

It is not a de Polignac number, because 2187077561 - 2²² = 2182883257 is a prime.

It is not a weakly prime, because it can be changed into another prime (2187077531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093538780 + 1093538781.

It is an arithmetic number, because the mean of its divisors is an integer number (1093538781).

Almost surely, 2^2187077561 is an apocalyptic number.

It is an amenable number.

2187077561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187077561 is an equidigital number, since it uses as much as digits as its factorization.

2187077561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 164640, while the sum is 44.

The square root of 2187077561 is about 46766.2010537525. The cubic root of 2187077561 is about 1298.0399577206.

The spelling of 2187077561 in words is "two billion, one hundred eighty-seven million, seventy-seven thousand, five hundred sixty-one".