70505081 has 4 divisors (see below), whose sum is σ = 71660964. Its totient is φ = 69349200.

The previous prime is 70505047. The next prime is 70505131. The reversal of 70505081 is 18050507.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18050507 = 113 ⋅159739.

It can be written as a sum of positive squares in 2 ways, for example, as 40704400 + 29800681 = 6380^2 + 5459^2 .

It is a cyclic number.

It is not a de Polignac number, because 70505081 - 2¹⁸ = 70242937 is a prime.

It is a super-2 number, since 2×70505081² = 9941932893633122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70505081.

It is not an unprimeable number, because it can be changed into a prime (70505041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577850 + ... + 577971.

It is an arithmetic number, because the mean of its divisors is an integer number (17915241).

Almost surely, 2^70505081 is an apocalyptic number.

It is an amenable number.

70505081 is a deficient number, since it is larger than the sum of its proper divisors (1155883).

70505081 is a wasteful number, since it uses less digits than its factorization.

70505081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155882.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 70505081 is about 8396.7303755688. The cubic root of 70505081 is about 413.1173853901.

Adding to 70505081 its reverse (18050507), we get a palindrome (88555588).

The spelling of 70505081 in words is "seventy million, five hundred five thousand, eighty-one".