70651681 has 2 divisors, whose sum is σ = 70651682. Its totient is φ = 70651680.

The previous prime is 70651673. The next prime is 70651771. The reversal of 70651681 is 18615607.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37933281 + 32718400 = 6159^2 + 5720^2 .

It is a cyclic number.

It is not a de Polignac number, because 70651681 - 2³ = 70651673 is a prime.

It is a super-2 number, since 2×70651681² = 9983320056251522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (70651381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35325840 + 35325841.

It is an arithmetic number, because the mean of its divisors is an integer number (35325841).

Almost surely, 2^70651681 is an apocalyptic number.

It is an amenable number.

70651681 is a deficient number, since it is larger than the sum of its proper divisors (1).

70651681 is an equidigital number, since it uses as much as digits as its factorization.

70651681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 70651681 is about 8405.4554308497. The cubic root of 70651681 is about 413.4035164527.

The spelling of 70651681 in words is "seventy million, six hundred fifty-one thousand, six hundred eighty-one".