621452401 has 4 divisors (see below), whose sum is σ = 633177972. Its totient is φ = 609726832.

The previous prime is 621452371. The next prime is 621452411. The reversal of 621452401 is 104254126.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 474194176 + 147258225 = 21776^2 + 12135^2 .

It is a cyclic number.

It is not a de Polignac number, because 621452401 - 2¹³ = 621444209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621452411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5862706 + ... + 5862811.

It is an arithmetic number, because the mean of its divisors is an integer number (158294493).

Almost surely, 2^621452401 is an apocalyptic number.

It is an amenable number.

621452401 is a deficient number, since it is larger than the sum of its proper divisors (11725571).

621452401 is a wasteful number, since it uses less digits than its factorization.

621452401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11725570.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 621452401 is about 24928.9470495647. The cubic root of 621452401 is about 853.3672205205.

It can be divided in two parts, 62145 and 2401, that added together give a palindrome (64546).

The spelling of 621452401 in words is "six hundred twenty-one million, four hundred fifty-two thousand, four hundred one".