621242431 has 2 divisors, whose sum is σ = 621242432. Its totient is φ = 621242430.

The previous prime is 621242423. The next prime is 621242497. The reversal of 621242431 is 134242126.

It is a happy number.

621242431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621242431 - 2³ = 621242423 is a prime.

It is a super-2 number, since 2×621242431² = 771884316149579522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621242396 and 621242405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621242231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310621215 + 310621216.

It is an arithmetic number, because the mean of its divisors is an integer number (310621216).

Almost surely, 2^621242431 is an apocalyptic number.

621242431 is a deficient number, since it is larger than the sum of its proper divisors (1).

621242431 is an equidigital number, since it uses as much as digits as its factorization.

621242431 is an odious number, because the sum of its binary digits is odd.

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

The square root of 621242431 is about 24924.7353245727. The cubic root of 621242431 is about 853.2711006896.

Adding to 621242431 its reverse (134242126), we get a palindrome (755484557).

The spelling of 621242431 in words is "six hundred twenty-one million, two hundred forty-two thousand, four hundred thirty-one".