621697 has 2 divisors, whose sum is σ = 621698. Its totient is φ = 621696.

The previous prime is 621679. The next prime is 621701. The reversal of 621697 is 796126.

Together with previous prime (621679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 318096 + 303601 = 564^2 + 551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621697 is a prime.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (621617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310848 + 310849.

It is an arithmetic number, because the mean of its divisors is an integer number (310849).

2⁶²¹⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

621697 is a deficient number, since it is larger than the sum of its proper divisors (1).

621697 is an equidigital number, since it uses as much as digits as its factorization.

621697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 621697 is about 788.4776471150. The cubic root of 621697 is about 85.3479165479.

The spelling of 621697 in words is "six hundred twenty-one thousand, six hundred ninety-seven".