32315821 has 2 divisors, whose sum is σ = 32315822. Its totient is φ = 32315820.

The previous prime is 32315797. The next prime is 32315839. The reversal of 32315821 is 12851323.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24950025 + 7365796 = 4995^2 + 2714^2 .

It is an emirp because it is prime and its reverse (12851323) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 32315821 - 2¹¹ = 32313773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32315321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16157910 + 16157911.

It is an arithmetic number, because the mean of its divisors is an integer number (16157911).

Almost surely, 2^32315821 is an apocalyptic number.

It is an amenable number.

32315821 is a deficient number, since it is larger than the sum of its proper divisors (1).

32315821 is an equidigital number, since it uses as much as digits as its factorization.

32315821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 32315821 is about 5684.7006077717. The cubic root of 32315821 is about 318.5212401438.

The spelling of 32315821 in words is "thirty-two million, three hundred fifteen thousand, eight hundred twenty-one".