70252781 has 2 divisors, whose sum is σ = 70252782. Its totient is φ = 70252780.

The previous prime is 70252757. The next prime is 70252813. The reversal of 70252781 is 18725207.

It is an a-pointer prime, because the next prime (70252813) can be obtained adding 70252781 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59428681 + 10824100 = 7709^2 + 3290^2 .

It is an emirp because it is prime and its reverse (18725207) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70252781 - 2²² = 66058477 is a prime.

It is a super-2 number, since 2×70252781² = 9870906476467922, 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 (70252711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35126390 + 35126391.

It is an arithmetic number, because the mean of its divisors is an integer number (35126391).

Almost surely, 2^70252781 is an apocalyptic number.

It is an amenable number.

70252781 is a deficient number, since it is larger than the sum of its proper divisors (1).

70252781 is an equidigital number, since it uses as much as digits as its factorization.

70252781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 70252781 is about 8381.6932060294. The cubic root of 70252781 is about 412.6240209883.

Adding to 70252781 its reverse (18725207), we get a palindrome (88977988).

The spelling of 70252781 in words is "seventy million, two hundred fifty-two thousand, seven hundred eighty-one".