70637321 has 2 divisors, whose sum is σ = 70637322. Its totient is φ = 70637320.

The previous prime is 70637299. The next prime is 70637387. The reversal of 70637321 is 12373607.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67831696 + 2805625 = 8236^2 + 1675^2 .

It is an emirp because it is prime and its reverse (12373607) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70637321 - 2²² = 66443017 is a prime.

It is a super-2 number, since 2×70637321² = 9979262236114082, which contains 22 as substring.

It is a Chen prime.

It is equal to p_4153385 and since 70637321 and 4153385 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (70637821) 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, 35318660 + 35318661.

It is an arithmetic number, because the mean of its divisors is an integer number (35318661).

Almost surely, 2^70637321 is an apocalyptic number.

It is an amenable number.

70637321 is a deficient number, since it is larger than the sum of its proper divisors (1).

70637321 is an equidigital number, since it uses as much as digits as its factorization.

70637321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 70637321 is about 8404.6011803059. The cubic root of 70637321 is about 413.3755063773.

The spelling of 70637321 in words is "seventy million, six hundred thirty-seven thousand, three hundred twenty-one".