70520081 has 2 divisors, whose sum is σ = 70520082. Its totient is φ = 70520080.

The previous prime is 70520059. The next prime is 70520101. The reversal of 70520081 is 18002507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70140625 + 379456 = 8375^2 + 616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70520081 is a prime.

It is a super-2 number, since 2×70520081² = 9946163648493122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (70520011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35260040 + 35260041.

It is an arithmetic number, because the mean of its divisors is an integer number (35260041).

Almost surely, 2^70520081 is an apocalyptic number.

It is an amenable number.

70520081 is a deficient number, since it is larger than the sum of its proper divisors (1).

70520081 is an equidigital number, since it uses as much as digits as its factorization.

70520081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 70520081 is about 8397.6235328812. The cubic root of 70520081 is about 413.1466803065.

Adding to 70520081 its reverse (18002507), we get a palindrome (88522588).

The spelling of 70520081 in words is "seventy million, five hundred twenty thousand, eighty-one".