1982169131 has 2 divisors, whose sum is σ = 1982169132. Its totient is φ = 1982169130.

The previous prime is 1982169113. The next prime is 1982169157. The reversal of 1982169131 is 1319612891.

Together with previous prime (1982169113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1982169131 - 2²² = 1977974827 is a prime.

It is a super-2 number, since 2×1982169131² = 7857988927778590322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1982169731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991084565 + 991084566.

It is an arithmetic number, because the mean of its divisors is an integer number (991084566).

Almost surely, 2^1982169131 is an apocalyptic number.

1982169131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982169131 is an equidigital number, since it uses as much as digits as its factorization.

1982169131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 41.

The square root of 1982169131 is about 44521.5580477593. The cubic root of 1982169131 is about 1256.1656193879.

The spelling of 1982169131 in words is "one billion, nine hundred eighty-two million, one hundred sixty-nine thousand, one hundred thirty-one".