622640401 has 2 divisors, whose sum is σ = 622640402. Its totient is φ = 622640400.

The previous prime is 622640371. The next prime is 622640461. The reversal of 622640401 is 104046226.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 482241600 + 140398801 = 21960^2 + 11849^2 .

It is a cyclic number.

It is not a de Polignac number, because 622640401 - 2¹¹ = 622638353 is a prime.

It is not a weakly prime, because it can be changed into another prime (622640461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311320200 + 311320201.

It is an arithmetic number, because the mean of its divisors is an integer number (311320201).

Almost surely, 2^622640401 is an apocalyptic number.

It is an amenable number.

622640401 is a deficient number, since it is larger than the sum of its proper divisors (1).

622640401 is an equidigital number, since it uses as much as digits as its factorization.

622640401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 622640401 is about 24952.7633940612. The cubic root of 622640401 is about 853.9106544348.

Adding to 622640401 its reverse (104046226), we get a palindrome (726686627).

The spelling of 622640401 in words is "six hundred twenty-two million, six hundred forty thousand, four hundred one".