70335781 has 2 divisors, whose sum is σ = 70335782. Its totient is φ = 70335780.

The previous prime is 70335763. The next prime is 70335799. The reversal of 70335781 is 18753307.

It is a balanced prime because it is at equal distance from previous prime (70335763) and next prime (70335799).

It can be written as a sum of positive squares in only one way, i.e., 70308225 + 27556 = 8385^2 + 166^2 .

It is an emirp because it is prime and its reverse (18753307) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70335781 - 2²³ = 61947173 is a prime.

It is a super-2 number, since 2×70335781² = 9894244177759922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70335751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35167890 + 35167891.

It is an arithmetic number, because the mean of its divisors is an integer number (35167891).

Almost surely, 2^70335781 is an apocalyptic number.

It is an amenable number.

70335781 is a deficient number, since it is larger than the sum of its proper divisors (1).

70335781 is an equidigital number, since it uses as much as digits as its factorization.

70335781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 70335781 is about 8386.6430113604. The cubic root of 70335781 is about 412.7864549625.

The spelling of 70335781 in words is "seventy million, three hundred thirty-five thousand, seven hundred eighty-one".