621849149 has 2 divisors, whose sum is σ = 621849150. Its totient is φ = 621849148.

The previous prime is 621849143. The next prime is 621849227. The reversal of 621849149 is 941948126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 612909049 + 8940100 = 24757^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 621849149 - 2²⁰ = 620800573 is a prime.

It is a super-3 number, since 3×621849149³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621849143) 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, 310924574 + 310924575.

It is an arithmetic number, because the mean of its divisors is an integer number (310924575).

Almost surely, 2^621849149 is an apocalyptic number.

It is an amenable number.

621849149 is a deficient number, since it is larger than the sum of its proper divisors (1).

621849149 is an equidigital number, since it uses as much as digits as its factorization.

621849149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 44.

The square root of 621849149 is about 24936.9033562710. The cubic root of 621849149 is about 853.5487842855.

The spelling of 621849149 in words is "six hundred twenty-one million, eight hundred forty-nine thousand, one hundred forty-nine".