1989320131 has 2 divisors, whose sum is σ = 1989320132. Its totient is φ = 1989320130.

The previous prime is 1989320101. The next prime is 1989320147. The reversal of 1989320131 is 1310239891.

It is a strong prime.

It is an emirp because it is prime and its reverse (1310239891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1989320131 - 2¹³ = 1989311939 is a prime.

It is a super-2 number, since 2×1989320131² = 7914789167203714322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1989320101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994660065 + 994660066.

It is an arithmetic number, because the mean of its divisors is an integer number (994660066).

Almost surely, 2^1989320131 is an apocalyptic number.

1989320131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989320131 is an equidigital number, since it uses as much as digits as its factorization.

1989320131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1989320131 is about 44601.7951544554. The cubic root of 1989320131 is about 1257.6744142138.

The spelling of 1989320131 in words is "one billion, nine hundred eighty-nine million, three hundred twenty thousand, one hundred thirty-one".