1886887861 has 2 divisors, whose sum is σ = 1886887862. Its totient is φ = 1886887860.

The previous prime is 1886887829. The next prime is 1886887883. The reversal of 1886887861 is 1687886881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1632644836 + 254243025 = 40406^2 + 15945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1886887861 - 2⁵ = 1886887829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1886887861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1886887361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 943443930 + 943443931.

It is an arithmetic number, because the mean of its divisors is an integer number (943443931).

Almost surely, 2^1886887861 is an apocalyptic number.

It is an amenable number.

1886887861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1886887861 is an equidigital number, since it uses as much as digits as its factorization.

1886887861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8257536, while the sum is 61.

The square root of 1886887861 is about 43438.3224929324. The cubic root of 1886887861 is about 1235.7065921078.

The spelling of 1886887861 in words is "one billion, eight hundred eighty-six million, eight hundred eighty-seven thousand, eight hundred sixty-one".