70747681 has 2 divisors, whose sum is σ = 70747682. Its totient is φ = 70747680.

The previous prime is 70747679. The next prime is 70747711. The reversal of 70747681 is 18674707.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46580625 + 24167056 = 6825^2 + 4916^2 .

It is an emirp because it is prime and its reverse (18674707) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70747681 - 2¹ = 70747679 is a prime.

It is a super-2 number, since 2×70747681² = 10010468733755522, which contains 22 as substring.

Together with 70747679, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70747601) 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, 35373840 + 35373841.

It is an arithmetic number, because the mean of its divisors is an integer number (35373841).

Almost surely, 2^70747681 is an apocalyptic number.

It is an amenable number.

70747681 is a deficient number, since it is larger than the sum of its proper divisors (1).

70747681 is an equidigital number, since it uses as much as digits as its factorization.

70747681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 70747681 is about 8411.1640692594. The cubic root of 70747681 is about 413.5906730092.

The spelling of 70747681 in words is "seventy million, seven hundred forty-seven thousand, six hundred eighty-one".