1623331601 has 2 divisors, whose sum is σ = 1623331602. Its totient is φ = 1623331600.

The previous prime is 1623331553. The next prime is 1623331667. The reversal of 1623331601 is 1061333261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1224930001 + 398401600 = 34999^2 + 19960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623331601 - 2⁶ = 1623331537 is a prime.

It is not a weakly prime, because it can be changed into another prime (1623331681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811665800 + 811665801.

It is an arithmetic number, because the mean of its divisors is an integer number (811665801).

Almost surely, 2^1623331601 is an apocalyptic number.

It is an amenable number.

1623331601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623331601 is an equidigital number, since it uses as much as digits as its factorization.

1623331601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 1623331601 is about 40290.5894843945. The cubic root of 1623331601 is about 1175.2648507541.

Adding to 1623331601 its reverse (1061333261), we get a palindrome (2684664862).

The spelling of 1623331601 in words is "one billion, six hundred twenty-three million, three hundred thirty-one thousand, six hundred one".