70512581 has 2 divisors, whose sum is σ = 70512582. Its totient is φ = 70512580.

The previous prime is 70512539. The next prime is 70512587. The reversal of 70512581 is 18521507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65060356 + 5452225 = 8066^2 + 2335^2 .

It is an emirp because it is prime and its reverse (18521507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70512581 - 2⁶ = 70512517 is a prime.

It is a super-2 number, since 2×70512581² = 9944048158563122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70512587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35256290 + 35256291.

It is an arithmetic number, because the mean of its divisors is an integer number (35256291).

Almost surely, 2^70512581 is an apocalyptic number.

It is an amenable number.

70512581 is a deficient number, since it is larger than the sum of its proper divisors (1).

70512581 is an equidigital number, since it uses as much as digits as its factorization.

70512581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 70512581 is about 8397.1769661000. The cubic root of 70512581 is about 413.1320333676.

The spelling of 70512581 in words is "seventy million, five hundred twelve thousand, five hundred eighty-one".