621869919 has 16 divisors (see below), whose sum is σ = 926601984. Its totient is φ = 367697600.

The previous prime is 621869917. The next prime is 621869921. The reversal of 621869919 is 919968126.

It is an interprime number because it is at equal distance from previous prime (621869917) and next prime (621869921).

It is a cyclic number.

It is not a de Polignac number, because 621869919 - 2¹ = 621869917 is a prime.

It is a super-2 number, since 2×621869919² = 773444392314133122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621869917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228459 + ... + 231164.

It is an arithmetic number, because the mean of its divisors is an integer number (57912624).

Almost surely, 2^621869919 is an apocalyptic number.

621869919 is a deficient number, since it is larger than the sum of its proper divisors (304732065).

621869919 is a wasteful number, since it uses less digits than its factorization.

621869919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459678.

The product of its digits is 419904, while the sum is 51.

The square root of 621869919 is about 24937.3198038602. The cubic root of 621869919 is about 853.5582871319.

It can be divided in two parts, 621 and 869919, that added together give a triangular number (870540 = T₁₃₁₉).

The spelling of 621869919 in words is "six hundred twenty-one million, eight hundred sixty-nine thousand, nine hundred nineteen".