620493121 has 4 divisors (see below), whose sum is σ = 621851332. Its totient is φ = 619134912.

The previous prime is 620493113. The next prime is 620493161. The reversal of 620493121 is 121394026.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 582498225 + 37994896 = 24135^2 + 6164^2 .

It is a cyclic number.

It is not a de Polignac number, because 620493121 - 2³ = 620493113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 620493121.

It is not an unprimeable number, because it can be changed into a prime (620493161) 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 3 ways as a sum of consecutive naturals, for example, 678420 + ... + 679333.

It is an arithmetic number, because the mean of its divisors is an integer number (155462833).

Almost surely, 2^620493121 is an apocalyptic number.

It is an amenable number.

620493121 is a deficient number, since it is larger than the sum of its proper divisors (1358211).

620493121 is a wasteful number, since it uses less digits than its factorization.

620493121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358210.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 620493121 is about 24909.6993358009. The cubic root of 620493121 is about 852.9279057386.

The spelling of 620493121 in words is "six hundred twenty million, four hundred ninety-three thousand, one hundred twenty-one".