1981979059 has 8 divisors (see below), whose sum is σ = 2012393360. Its totient is φ = 1951589376.

The previous prime is 1981979057. The next prime is 1981979089. The reversal of 1981979059 is 9509791891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1981979059 - 2¹ = 1981979057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1981978994 and 1981979012.

It is not an unprimeable number, because it can be changed into a prime (1981979057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217507 + ... + 226435.

It is an arithmetic number, because the mean of its divisors is an integer number (251549170).

Almost surely, 2^1981979059 is an apocalyptic number.

1981979059 is a deficient number, since it is larger than the sum of its proper divisors (30414301).

1981979059 is an equidigital number, since it uses as much as digits as its factorization.

1981979059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12309.

The product of its (nonzero) digits is 1837080, while the sum is 58.

The square root of 1981979059 is about 44519.4233902462. The cubic root of 1981979059 is about 1256.1254664833.

The spelling of 1981979059 in words is "one billion, nine hundred eighty-one million, nine hundred seventy-nine thousand, fifty-nine".