1621004233 has 2 divisors, whose sum is σ = 1621004234. Its totient is φ = 1621004232.

The previous prime is 1621004191. The next prime is 1621004243. The reversal of 1621004233 is 3324001261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1469418889 + 151585344 = 38333^2 + 12312^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621004233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1621004243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810502116 + 810502117.

It is an arithmetic number, because the mean of its divisors is an integer number (810502117).

Almost surely, 2^1621004233 is an apocalyptic number.

It is an amenable number.

1621004233 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621004233 is an equidigital number, since it uses as much as digits as its factorization.

1621004233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1621004233 is about 40261.6968470034. The cubic root of 1621004233 is about 1174.7029236589.

Adding to 1621004233 its reverse (3324001261), we get a palindrome (4945005494).

The spelling of 1621004233 in words is "one billion, six hundred twenty-one million, four thousand, two hundred thirty-three".