1887814661 has 2 divisors, whose sum is σ = 1887814662. Its totient is φ = 1887814660.

The previous prime is 1887814651. The next prime is 1887814727. The reversal of 1887814661 is 1664187881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1476941761 + 410872900 = 38431^2 + 20270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1887814661 - 2¹⁴ = 1887798277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1887814651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 943907330 + 943907331.

It is an arithmetic number, because the mean of its divisors is an integer number (943907331).

Almost surely, 2^1887814661 is an apocalyptic number.

It is an amenable number.

1887814661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1887814661 is an equidigital number, since it uses as much as digits as its factorization.

1887814661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 50.

The square root of 1887814661 is about 43448.9891827186. The cubic root of 1887814661 is about 1235.9088767686.

The spelling of 1887814661 in words is "one billion, eight hundred eighty-seven million, eight hundred fourteen thousand, six hundred sixty-one".