1981599422 has 16 divisors (see below), whose sum is σ = 3347218944. Its totient is φ = 871671000.

The previous prime is 1981599397. The next prime is 1981599449. The reversal of 1981599422 is 2249951891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1452104 + ... + 1453467.

It is an arithmetic number, because the mean of its divisors is an integer number (209201184).

Almost surely, 2^1981599422 is an apocalyptic number.

1981599422 is a deficient number, since it is larger than the sum of its proper divisors (1365619522).

1981599422 is a wasteful number, since it uses less digits than its factorization.

1981599422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905615.

The product of its digits is 466560, while the sum is 50.

The square root of 1981599422 is about 44515.1594628167. The cubic root of 1981599422 is about 1256.0452600936.

The spelling of 1981599422 in words is "one billion, nine hundred eighty-one million, five hundred ninety-nine thousand, four hundred twenty-two".