620544261 has 4 divisors (see below), whose sum is σ = 827392352. Its totient is φ = 413696172.

The previous prime is 620544187. The next prime is 620544283. The reversal of 620544261 is 162445026.

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 not a de Polignac number, because 620544261 - 2¹⁰ = 620543237 is a prime.

It is a super-2 number, since 2×620544261² = 770150359720072242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620548261) 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, 103424041 + ... + 103424046.

It is an arithmetic number, because the mean of its divisors is an integer number (206848088).

Almost surely, 2^620544261 is an apocalyptic number.

It is an amenable number.

620544261 is a deficient number, since it is larger than the sum of its proper divisors (206848091).

620544261 is a wasteful number, since it uses less digits than its factorization.

620544261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206848090.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 620544261 is about 24910.7258224244. The cubic root of 620544261 is about 852.9513373897.

Adding to 620544261 its reverse (162445026), we get a palindrome (782989287).

The spelling of 620544261 in words is "six hundred twenty million, five hundred forty-four thousand, two hundred sixty-one".