70563721 has 2 divisors, whose sum is σ = 70563722. Its totient is φ = 70563720.

The previous prime is 70563707. The next prime is 70563749. The reversal of 70563721 is 12736507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70560000 + 3721 = 8400^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 70563721 - 2⁷ = 70563593 is a prime.

It is equal to p_4149337 and since 70563721 and 4149337 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 (70563791) 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, 35281860 + 35281861.

It is an arithmetic number, because the mean of its divisors is an integer number (35281861).

Almost surely, 2^70563721 is an apocalyptic number.

It is an amenable number.

70563721 is a deficient number, since it is larger than the sum of its proper divisors (1).

70563721 is an equidigital number, since it uses as much as digits as its factorization.

70563721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 70563721 is about 8400.2214851753. The cubic root of 70563721 is about 413.2318853670.

It can be divided in two parts, 7056 and 3721, that multiplied together give a square (26255376 = 5124²).

The spelling of 70563721 in words is "seventy million, five hundred sixty-three thousand, seven hundred twenty-one".