1989631613 has 2 divisors, whose sum is σ = 1989631614. Its totient is φ = 1989631612.

The previous prime is 1989631603. The next prime is 1989631639. The reversal of 1989631613 is 3161369891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1800898969 + 188732644 = 42437^2 + 13738^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989631613 - 2¹⁰ = 1989630589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989631603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994815806 + 994815807.

It is an arithmetic number, because the mean of its divisors is an integer number (994815807).

Almost surely, 2^1989631613 is an apocalyptic number.

It is an amenable number.

1989631613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989631613 is an equidigital number, since it uses as much as digits as its factorization.

1989631613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 47.

The square root of 1989631613 is about 44605.2868279086. The cubic root of 1989631613 is about 1257.7400517971.

The spelling of 1989631613 in words is "one billion, nine hundred eighty-nine million, six hundred thirty-one thousand, six hundred thirteen".