621400573 has 2 divisors, whose sum is σ = 621400574. Its totient is φ = 621400572.

The previous prime is 621400547. The next prime is 621400589. The reversal of 621400573 is 375004126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 507060324 + 114340249 = 22518^2 + 10693^2 .

It is a cyclic number.

It is not a de Polignac number, because 621400573 - 2⁹ = 621400061 is a prime.

It is a super-3 number, since 3×621400573³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621400543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310700286 + 310700287.

It is an arithmetic number, because the mean of its divisors is an integer number (310700287).

Almost surely, 2^621400573 is an apocalyptic number.

It is an amenable number.

621400573 is a deficient number, since it is larger than the sum of its proper divisors (1).

621400573 is an equidigital number, since it uses as much as digits as its factorization.

621400573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 621400573 is about 24927.9075134677. The cubic root of 621400573 is about 853.3434967695.

Adding to 621400573 its reverse (375004126), we get a palindrome (996404699).

The spelling of 621400573 in words is "six hundred twenty-one million, four hundred thousand, five hundred seventy-three".