42982981 has 4 divisors (see below), whose sum is σ = 43118892. Its totient is φ = 42847072.

The previous prime is 42982967. The next prime is 42983009. The reversal of 42982981 is 18928924.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25090081 + 17892900 = 5009^2 + 4230^2 .

It is a cyclic number.

It is not a de Polignac number, because 42982981 - 2⁵ = 42982949 is a prime.

It is a super-2 number, since 2×42982981² = 3695073311292722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42982081) 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, 67480 + ... + 68113.

It is an arithmetic number, because the mean of its divisors is an integer number (10779723).

Almost surely, 2^42982981 is an apocalyptic number.

It is an amenable number.

42982981 is a deficient number, since it is larger than the sum of its proper divisors (135911).

42982981 is a wasteful number, since it uses less digits than its factorization.

42982981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135910.

The product of its digits is 82944, while the sum is 43.

The square root of 42982981 is about 6556.1407092893. The cubic root of 42982981 is about 350.2935795274.

The spelling of 42982981 in words is "forty-two million, nine hundred eighty-two thousand, nine hundred eighty-one".