70257221 has 2 divisors, whose sum is σ = 70257222. Its totient is φ = 70257220.

The previous prime is 70257199. The next prime is 70257241. The reversal of 70257221 is 12275207.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69472225 + 784996 = 8335^2 + 886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70257221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70257241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35128610 + 35128611.

It is an arithmetic number, because the mean of its divisors is an integer number (35128611).

Almost surely, 2^70257221 is an apocalyptic number.

It is an amenable number.

70257221 is a deficient number, since it is larger than the sum of its proper divisors (1).

70257221 is an equidigital number, since it uses as much as digits as its factorization.

70257221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 70257221 is about 8381.9580647961. The cubic root of 70257221 is about 412.6327134653.

The spelling of 70257221 in words is "seventy million, two hundred fifty-seven thousand, two hundred twenty-one".