83151621 has 24 divisors (see below), whose sum is σ = 137691840. Its totient is φ = 47367936.

The previous prime is 83151587. The next prime is 83151661. The reversal of 83151621 is 12615138.

83151621 is a `hidden beast` number, since 8 + 31 + 5 + 1 + 621 = 666.

It is not a de Polignac number, because 83151621 - 2¹³ = 83143429 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83151661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20370 + ... + 24108.

It is an arithmetic number, because the mean of its divisors is an integer number (5737160).

Almost surely, 2^83151621 is an apocalyptic number.

It is an amenable number.

83151621 is a deficient number, since it is larger than the sum of its proper divisors (54540219).

83151621 is a wasteful number, since it uses less digits than its factorization.

83151621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105 (or 4102 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 83151621 is about 9118.7510657984. The cubic root of 83151621 is about 436.4725206384.

Adding to 83151621 its reverse (12615138), we get a palindrome (95766759).

The spelling of 83151621 in words is "eighty-three million, one hundred fifty-one thousand, six hundred twenty-one".