621622001 has 32 divisors (see below), whose sum is σ = 850445568. Its totient is φ = 438647040.

The previous prime is 621621997. The next prime is 621622003. The reversal of 621622001 is 100226126.

It is a happy number.

It is not a de Polignac number, because 621622001 - 2² = 621621997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (621622003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47195 + ... + 58911.

It is an arithmetic number, because the mean of its divisors is an integer number (26576424).

Almost surely, 2^621622001 is an apocalyptic number.

It is an amenable number.

621622001 is a deficient number, since it is larger than the sum of its proper divisors (228823567).

621622001 is a wasteful number, since it uses less digits than its factorization.

621622001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11801.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 621622001 is about 24932.3484854516. The cubic root of 621622001 is about 853.4448440125. Note that the first 3 decimals are identical.

Adding to 621622001 its reverse (100226126), we get a palindrome (721848127).

The spelling of 621622001 in words is "six hundred twenty-one million, six hundred twenty-two thousand, one".