70570781 has 2 divisors, whose sum is σ = 70570782. Its totient is φ = 70570780.

The previous prime is 70570777. The next prime is 70570789. The reversal of 70570781 is 18707507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46648900 + 23921881 = 6830^2 + 4891^2 .

It is a cyclic number.

It is not a de Polignac number, because 70570781 - 2² = 70570777 is a prime.

It is a super-2 number, since 2×70570781² = 9960470261899922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70570789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35285390 + 35285391.

It is an arithmetic number, because the mean of its divisors is an integer number (35285391).

Almost surely, 2^70570781 is an apocalyptic number.

It is an amenable number.

70570781 is a deficient number, since it is larger than the sum of its proper divisors (1).

70570781 is an equidigital number, since it uses as much as digits as its factorization.

70570781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13720, while the sum is 35.

The square root of 70570781 is about 8400.6417016797. The cubic root of 70570781 is about 413.2456663854.

The spelling of 70570781 in words is "seventy million, five hundred seventy thousand, seven hundred eighty-one".