620851 has 12 divisors (see below), whose sum is σ = 780976. Its totient is φ = 483120.

The previous prime is 620849. The next prime is 620869. The reversal of 620851 is 158026.

620851 = 49² + 50² + ... + 125².

It is a happy number.

It is not a de Polignac number, because 620851 - 2¹ = 620849 is a prime.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (620821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 481 + ... + 1213.

2⁶²⁰⁸⁵¹ is an apocalyptic number.

620851 is a deficient number, since it is larger than the sum of its proper divisors (160125).

620851 is a wasteful number, since it uses less digits than its factorization.

620851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762 (or 751 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 620851 is about 787.9409876380. The cubic root of 620851 is about 85.3091854008.

Adding to 620851 its reverse (158026), we get a palindrome (778877).

The spelling of 620851 in words is "six hundred twenty thousand, eight hundred fifty-one".