621002 has 4 divisors (see below), whose sum is σ = 931506. Its totient is φ = 310500.

The previous prime is 620999. The next prime is 621007. The reversal of 621002 is 200126.

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

It can be written as a sum of positive squares in only one way, i.e., 606841 + 14161 = 779^2 + 119^2 .

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621002.

It is not an unprimeable number, because it can be changed into a prime (621007) 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 as a sum of consecutive naturals, namely, 155249 + ... + 155252.

2⁶²¹⁰⁰² is an apocalyptic number.

621002 is a deficient number, since it is larger than the sum of its proper divisors (310504).

621002 is a wasteful number, since it uses less digits than its factorization.

621002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310503.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 621002 is about 788.0368011711. The cubic root of 621002 is about 85.3161009854.

Adding to 621002 its reverse (200126), we get a palindrome (821128).

The spelling of 621002 in words is "six hundred twenty-one thousand, two".