70571621 has 2 divisors, whose sum is σ = 70571622. Its totient is φ = 70571620.

The previous prime is 70571597. The next prime is 70571623. The reversal of 70571621 is 12617507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43375396 + 27196225 = 6586^2 + 5215^2 .

It is a cyclic number.

It is not a de Polignac number, because 70571621 - 2¹⁰ = 70570597 is a prime.

Together with 70571623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70571623) 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 as a sum of consecutive naturals, namely, 35285810 + 35285811.

It is an arithmetic number, because the mean of its divisors is an integer number (35285811).

Almost surely, 2^70571621 is an apocalyptic number.

It is an amenable number.

70571621 is a deficient number, since it is larger than the sum of its proper divisors (1).

70571621 is an equidigital number, since it uses as much as digits as its factorization.

70571621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 70571621 is about 8400.6916977116. The cubic root of 70571621 is about 413.2473059921.

The spelling of 70571621 in words is "seventy million, five hundred seventy-one thousand, six hundred twenty-one".