620101621 has 2 divisors, whose sum is σ = 620101622. Its totient is φ = 620101620.

The previous prime is 620101619. The next prime is 620101633. The reversal of 620101621 is 126101026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421686225 + 198415396 = 20535^2 + 14086^2 .

It is a cyclic number.

It is not a de Polignac number, because 620101621 - 2¹ = 620101619 is a prime.

Together with 620101619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620101021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310050810 + 310050811.

It is an arithmetic number, because the mean of its divisors is an integer number (310050811).

Almost surely, 2^620101621 is an apocalyptic number.

It is an amenable number.

620101621 is a deficient number, since it is larger than the sum of its proper divisors (1).

620101621 is an equidigital number, since it uses as much as digits as its factorization.

620101621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 620101621 is about 24901.8397111539. The cubic root of 620101621 is about 852.7484831055.

Adding to 620101621 its reverse (126101026), we get a palindrome (746202647).

The spelling of 620101621 in words is "six hundred twenty million, one hundred one thousand, six hundred twenty-one".