621121069 has 2 divisors, whose sum is σ = 621121070. Its totient is φ = 621121068.

The previous prime is 621121037. The next prime is 621121133. The reversal of 621121069 is 960121126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382789225 + 238331844 = 19565^2 + 15438^2 .

It is a cyclic number.

It is not a de Polignac number, because 621121069 - 2⁵ = 621121037 is a prime.

It is a super-2 number, since 2×621121069² = 771582764711405522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621121019) 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, 310560534 + 310560535.

It is an arithmetic number, because the mean of its divisors is an integer number (310560535).

Almost surely, 2^621121069 is an apocalyptic number.

It is an amenable number.

621121069 is a deficient number, since it is larger than the sum of its proper divisors (1).

621121069 is an equidigital number, since it uses as much as digits as its factorization.

621121069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 621121069 is about 24922.3006361772. The cubic root of 621121069 is about 853.2155338522.

The spelling of 621121069 in words is "six hundred twenty-one million, one hundred twenty-one thousand, sixty-nine".