70621 has 2 divisors, whose sum is σ = 70622. Its totient is φ = 70620.

The previous prime is 70619. The next prime is 70627. The reversal of 70621 is 12607.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68121 + 2500 = 261^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 70621 - 2¹ = 70619 is a prime.

Together with 70619, it forms a pair of twin primes.

It is a plaindrome in base 9 and base 16.

It is a junction number, because it is equal to n+sod(n) for n = 70595 and 70604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35310 + 35311.

It is an arithmetic number, because the mean of its divisors is an integer number (35311).

2⁷⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

70621 is a deficient number, since it is larger than the sum of its proper divisors (1).

70621 is an equidigital number, since it uses as much as digits as its factorization.

70621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 70621 is about 265.7461194449. The cubic root of 70621 is about 41.3343666640.

It can be divided in two parts, 706 and 21, that added together give a palindrome (727).

The spelling of 70621 in words is "seventy thousand, six hundred twenty-one".