83553981 has 8 divisors (see below), whose sum is σ = 127320384. Its totient is φ = 47745120.

The previous prime is 83553973. The next prime is 83553989. The reversal of 83553981 is 18935538.

It is an interprime number because it is at equal distance from previous prime (83553973) and next prime (83553989).

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

It is not a de Polignac number, because 83553981 - 2³ = 83553973 is a prime.

It is a super-2 number, since 2×83553981² = 13962535481896722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83553989) 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 7 ways as a sum of consecutive naturals, for example, 1989360 + ... + 1989401.

It is an arithmetic number, because the mean of its divisors is an integer number (15915048).

Almost surely, 2^83553981 is an apocalyptic number.

It is an amenable number.

83553981 is a deficient number, since it is larger than the sum of its proper divisors (43766403).

83553981 is a wasteful number, since it uses less digits than its factorization.

83553981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978771.

The product of its digits is 129600, while the sum is 42.

The square root of 83553981 is about 9140.7866729292. The cubic root of 83553981 is about 437.1753996053.

The spelling of 83553981 in words is "eighty-three million, five hundred fifty-three thousand, nine hundred eighty-one".