620693441281 has 27 divisors (see below), whose sum is σ = 647192080899. Its totient is φ = 595267448688.

The previous prime is 620693441273. The next prime is 620693441399. The reversal of 620693441281 is 182144396026.

The square root of 620693441281 is 787841.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 555405015025 + 65288426256 = 745255^2 + 255516^2 .

It is not a de Polignac number, because 620693441281 - 2³ = 620693441273 is a prime.

It is a super-2 number, since 2×620693441281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620693441681) 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 26 ways as a sum of consecutive naturals, for example, 3119062420 + ... + 3119062618.

Almost surely, 2^620693441281 is an apocalyptic number.

620693441281 is the 787841-st square number.

620693441281 is the 393921-st centered octagonal number.

It is an amenable number.

620693441281 is a deficient number, since it is larger than the sum of its proper divisors (26498639618).

620693441281 is an frugal number, since it uses more digits than its factorization.

620693441281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 620693441281 in words is "six hundred twenty billion, six hundred ninety-three million, four hundred forty-one thousand, two hundred eighty-one".