1981305467 has 4 divisors (see below), whose sum is σ = 1981872336. Its totient is φ = 1980738600.

The previous prime is 1981305421. The next prime is 1981305479. The reversal of 1981305467 is 7645031891.

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 1981305467 - 2⁸ = 1981305211 is a prime.

It is a super-3 number, since 3×1981305467³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1981305407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278159 + ... + 285192.

It is an arithmetic number, because the mean of its divisors is an integer number (495468084).

Almost surely, 2^1981305467 is an apocalyptic number.

1981305467 is a deficient number, since it is larger than the sum of its proper divisors (566869).

1981305467 is an equidigital number, since it uses as much as digits as its factorization.

1981305467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566868.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 1981305467 is about 44511.8575999699. The cubic root of 1981305467 is about 1255.9831488114.

The spelling of 1981305467 in words is "one billion, nine hundred eighty-one million, three hundred five thousand, four hundred sixty-seven".