1230981859 has 4 divisors (see below), whose sum is σ = 1231494840. Its totient is φ = 1230468880.

The previous prime is 1230981847. The next prime is 1230981863. The reversal of 1230981859 is 9581890321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1230981859 - 2¹⁵ = 1230949091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1230981889) 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 in 3 ways as a sum of consecutive naturals, for example, 252874 + ... + 257695.

It is an arithmetic number, because the mean of its divisors is an integer number (307873710).

Almost surely, 2^1230981859 is an apocalyptic number.

1230981859 is a deficient number, since it is larger than the sum of its proper divisors (512981).

1230981859 is an equidigital number, since it uses as much as digits as its factorization.

1230981859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512980.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 1230981859 is about 35085.3510599509. The cubic root of 1230981859 is about 1071.7262898679.

The spelling of 1230981859 in words is "one billion, two hundred thirty million, nine hundred eighty-one thousand, eight hundred fifty-nine".