621645149 has 8 divisors (see below), whose sum is σ = 624656448. Its totient is φ = 618640960.

The previous prime is 621645049. The next prime is 621645187. The reversal of 621645149 is 941546126.

621645149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621645149 - 2⁸ = 621644893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621645049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255989 + ... + 258405.

It is an arithmetic number, because the mean of its divisors is an integer number (78082056).

Almost surely, 2^621645149 is an apocalyptic number.

It is an amenable number.

621645149 is a deficient number, since it is larger than the sum of its proper divisors (3011299).

621645149 is a wasteful number, since it uses less digits than its factorization.

621645149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3555.

The product of its digits is 51840, while the sum is 38.

The square root of 621645149 is about 24932.8126973272. The cubic root of 621645149 is about 853.4554374256.

The spelling of 621645149 in words is "six hundred twenty-one million, six hundred forty-five thousand, one hundred forty-nine".