621000900061 has 2 divisors, whose sum is σ = 621000900062. Its totient is φ = 621000900060.

The previous prime is 621000900041. The next prime is 621000900127. The reversal of 621000900061 is 160009000126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 548414302500 + 72586597561 = 740550^2 + 269419^2 .

It is a cyclic number.

It is not a de Polignac number, because 621000900061 - 2²¹ = 620998802909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 621000899999 and 621000900035.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621000900041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310500450030 + 310500450031.

It is an arithmetic number, because the mean of its divisors is an integer number (310500450031).

Almost surely, 2^621000900061 is an apocalyptic number.

It is an amenable number.

621000900061 is a deficient number, since it is larger than the sum of its proper divisors (1).

621000900061 is an equidigital number, since it uses as much as digits as its factorization.

621000900061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

Adding to 621000900061 its reverse (160009000126), we get a palindrome (781009900187).

The spelling of 621000900061 in words is "six hundred twenty-one billion, nine hundred thousand, sixty-one".