83421553 has 6 divisors (see below), whose sum is σ = 84643494. Its totient is φ = 82201824.

The previous prime is 83421539. The next prime is 83421577. The reversal of 83421553 is 35512438.

It can be written as a sum of positive squares in 3 ways, for example, as 12306064 + 71115489 = 3508^2 + 8433^2 .

It is a de Polignac number, because none of the positive numbers 2^k-83421553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83421053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77503 + ... + 78571.

It is an arithmetic number, because the mean of its divisors is an integer number (14107249).

Almost surely, 2^83421553 is an apocalyptic number.

It is an amenable number.

83421553 is a deficient number, since it is larger than the sum of its proper divisors (1221941).

83421553 is an frugal number, since it uses more digits than its factorization.

83421553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211 (or 1142 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 83421553 is about 9133.5400037444. The cubic root of 83421553 is about 436.9443119643.

The spelling of 83421553 in words is "eighty-three million, four hundred twenty-one thousand, five hundred fifty-three".