1986386472391 has 2 divisors, whose sum is σ = 1986386472392. Its totient is φ = 1986386472390.

The previous prime is 1986386472271. The next prime is 1986386472397. The reversal of 1986386472391 is 1932746836891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1986386472391 - 2⁹ = 1986386471879 is a prime.

It is a super-2 number, since 2×1986386472391² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1986386472397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993193236195 + 993193236196.

It is an arithmetic number, because the mean of its divisors is an integer number (993193236196).

Almost surely, 2^{1986386472391} is an apocalyptic number.

1986386472391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986386472391 is an equidigital number, since it uses as much as digits as its factorization.

1986386472391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94058496, while the sum is 67.

The spelling of 1986386472391 in words is "one trillion, nine hundred eighty-six billion, three hundred eighty-six million, four hundred seventy-two thousand, three hundred ninety-one".