621534413 has 2 divisors, whose sum is σ = 621534414. Its totient is φ = 621534412.

The previous prime is 621534391. The next prime is 621534443. The reversal of 621534413 is 314435126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 526335364 + 95199049 = 22942^2 + 9757^2 .

It is a cyclic number.

It is not a de Polignac number, because 621534413 - 2⁶ = 621534349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621534443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310767206 + 310767207.

It is an arithmetic number, because the mean of its divisors is an integer number (310767207).

Almost surely, 2^621534413 is an apocalyptic number.

It is an amenable number.

621534413 is a deficient number, since it is larger than the sum of its proper divisors (1).

621534413 is an equidigital number, since it uses as much as digits as its factorization.

621534413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 621534413 is about 24930.5919103418. The cubic root of 621534413 is about 853.4047580020.

Adding to 621534413 its reverse (314435126), we get a palindrome (935969539).

It can be divided in two parts, 62153 and 4413, that added together give a palindrome (66566).

The spelling of 621534413 in words is "six hundred twenty-one million, five hundred thirty-four thousand, four hundred thirteen".