83081621 has 16 divisors (see below), whose sum is σ = 97668480. Its totient is φ = 69189120.

The previous prime is 83081591. The next prime is 83081627. The reversal of 83081621 is 12618038.

It is not a de Polignac number, because 83081621 - 2²² = 78887317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83081627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96290 + ... + 97148.

It is an arithmetic number, because the mean of its divisors is an integer number (6104280).

Almost surely, 2^83081621 is an apocalyptic number.

It is an amenable number.

83081621 is a deficient number, since it is larger than the sum of its proper divisors (14586859).

83081621 is a wasteful number, since it uses less digits than its factorization.

83081621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 83081621 is about 9114.9120127404. The cubic root of 83081621 is about 436.3500068752.

Adding to 83081621 its reverse (12618038), we get a palindrome (95699659).

The spelling of 83081621 in words is "eighty-three million, eighty-one thousand, six hundred twenty-one".