1986355913 has 2 divisors, whose sum is σ = 1986355914. Its totient is φ = 1986355912.

The previous prime is 1986355909. The next prime is 1986355937. The reversal of 1986355913 is 3195536891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1964528329 + 21827584 = 44323^2 + 4672^2 .

It is an emirp because it is prime and its reverse (3195536891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1986355913 - 2² = 1986355909 is a prime.

It is a super-2 number, since 2×1986355913² = 7891219626220127138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1986355963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993177956 + 993177957.

It is an arithmetic number, because the mean of its divisors is an integer number (993177957).

Almost surely, 2^1986355913 is an apocalyptic number.

It is an amenable number.

1986355913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986355913 is an equidigital number, since it uses as much as digits as its factorization.

1986355913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874800, while the sum is 50.

The square root of 1986355913 is about 44568.5529605797. The cubic root of 1986355913 is about 1257.0494311222.

The spelling of 1986355913 in words is "one billion, nine hundred eighty-six million, three hundred fifty-five thousand, nine hundred thirteen".