1981308562 has 8 divisors (see below), whose sum is σ = 3128382000. Its totient is φ = 938514564.

The previous prime is 1981308557. The next prime is 1981308569. The reversal of 1981308562 is 2658031891.

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

It is a super-3 number, since 3×1981308562³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1981308569) 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, 26069812 + ... + 26069887.

It is an arithmetic number, because the mean of its divisors is an integer number (391047750).

Almost surely, 2^1981308562 is an apocalyptic number.

1981308562 is a deficient number, since it is larger than the sum of its proper divisors (1147073438).

1981308562 is a wasteful number, since it uses less digits than its factorization.

1981308562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52139720.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 1981308562 is about 44511.8923659734. The cubic root of 1981308562 is about 1255.9838028021.

The spelling of 1981308562 in words is "one billion, nine hundred eighty-one million, three hundred eight thousand, five hundred sixty-two".