621006497 has 4 divisors (see below), whose sum is σ = 621212436. Its totient is φ = 620800560.

The previous prime is 621006443. The next prime is 621006499. The reversal of 621006497 is 794600126.

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 363436096 + 257570401 = 19064^2 + 16049^2 .

It is a cyclic number.

It is not a de Polignac number, because 621006497 - 2¹⁸ = 620744353 is a prime.

It is a super-2 number, since 2×621006497² = 771298138632422018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621006499) 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, 98378 + ... + 104499.

It is an arithmetic number, because the mean of its divisors is an integer number (155303109).

Almost surely, 2^621006497 is an apocalyptic number.

It is an amenable number.

621006497 is a deficient number, since it is larger than the sum of its proper divisors (205939).

621006497 is a wasteful number, since it uses less digits than its factorization.

621006497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205938.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 621006497 is about 24920.0019462279. The cubic root of 621006497 is about 853.1630692436.

The spelling of 621006497 in words is "six hundred twenty-one million, six thousand, four hundred ninety-seven".