621409532481 has 6 divisors (see below), whose sum is σ = 897591546930. Its totient is φ = 414273021648.

The previous prime is 621409532461. The next prime is 621409532551. The reversal of 621409532481 is 184235904126.

621409532481 is a `hidden beast` number, since 62 + 14 + 0 + 9 + 532 + 48 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 618607418256 + 2802114225 = 786516^2 + 52935^2 .

It is not a de Polignac number, because 621409532481 - 2¹⁷ = 621409401409 is a prime.

It is a super-2 number, since 2×621409532481² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621409532431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34522751796 + ... + 34522751813.

It is an arithmetic number, because the mean of its divisors is an integer number (149598591155).

Almost surely, 2^621409532481 is an apocalyptic number.

It is an amenable number.

621409532481 is a deficient number, since it is larger than the sum of its proper divisors (276182014449).

621409532481 is a wasteful number, since it uses less digits than its factorization.

621409532481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69045503615 (or 69045503612 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 621409532481 in words is "six hundred twenty-one billion, four hundred nine million, five hundred thirty-two thousand, four hundred eighty-one".