105974801981 has 4 divisors (see below), whose sum is σ = 105975454464. Its totient is φ = 105974149500.

The previous prime is 105974801957. The next prime is 105974802049. The reversal of 105974801981 is 189108479501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 189108479501 = 36563 ⋅5172127.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105974801981 is a prime.

It is a super-2 number, since 2×105974801981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105974801281) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 131006 + ... + 478656.

It is an arithmetic number, because the mean of its divisors is an integer number (26493863616).

Almost surely, 2^105974801981 is an apocalyptic number.

It is an amenable number.

105974801981 is a deficient number, since it is larger than the sum of its proper divisors (652483).

105974801981 is an equidigital number, since it uses as much as digits as its factorization.

105974801981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652482.

The product of its (nonzero) digits is 725760, while the sum is 53.

The spelling of 105974801981 in words is "one hundred five billion, nine hundred seventy-four million, eight hundred one thousand, nine hundred eighty-one".