620509249 has 4 divisors (see below), whose sum is σ = 647487936. Its totient is φ = 593530564.

The previous prime is 620509243. The next prime is 620509261. The reversal of 620509249 is 942905026.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 620509249 - 2⁷ = 620509121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620509243) 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 in 3 ways as a sum of consecutive naturals, for example, 13489309 + ... + 13489354.

It is an arithmetic number, because the mean of its divisors is an integer number (161871984).

Almost surely, 2^620509249 is an apocalyptic number.

It is an amenable number.

620509249 is a deficient number, since it is larger than the sum of its proper divisors (26978687).

620509249 is a wasteful number, since it uses less digits than its factorization.

620509249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26978686.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 620509249 is about 24910.0230630162. The cubic root of 620509249 is about 852.9352955074.

The spelling of 620509249 in words is "six hundred twenty million, five hundred nine thousand, two hundred forty-nine".