621103723 has 2 divisors, whose sum is σ = 621103724. Its totient is φ = 621103722.

The previous prime is 621103663. The next prime is 621103727. The reversal of 621103723 is 327301126.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621103723 is a prime.

It is not a weakly prime, because it can be changed into another prime (621103727) 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 as a sum of consecutive naturals, namely, 310551861 + 310551862.

It is an arithmetic number, because the mean of its divisors is an integer number (310551862).

Almost surely, 2^621103723 is an apocalyptic number.

621103723 is a deficient number, since it is larger than the sum of its proper divisors (1).

621103723 is an equidigital number, since it uses as much as digits as its factorization.

621103723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 621103723 is about 24921.9526321675. The cubic root of 621103723 is about 853.2075912169.

Adding to 621103723 its reverse (327301126), we get a palindrome (948404849).

The spelling of 621103723 in words is "six hundred twenty-one million, one hundred three thousand, seven hundred twenty-three".