70575781 has 2 divisors, whose sum is σ = 70575782. Its totient is φ = 70575780.

The previous prime is 70575773. The next prime is 70575797. The reversal of 70575781 is 18757507.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68973025 + 1602756 = 8305^2 + 1266^2 .

It is a cyclic number.

It is not a de Polignac number, because 70575781 - 2³ = 70575773 is a prime.

It is a super-2 number, since 2×70575781² = 9961881727519922, 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 (70575731) 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, 35287890 + 35287891.

It is an arithmetic number, because the mean of its divisors is an integer number (35287891).

Almost surely, 2^70575781 is an apocalyptic number.

It is an amenable number.

70575781 is a deficient number, since it is larger than the sum of its proper divisors (1).

70575781 is an equidigital number, since it uses as much as digits as its factorization.

70575781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68600, while the sum is 40.

The square root of 70575781 is about 8400.9392927220. The cubic root of 70575781 is about 413.2554257575.

The spelling of 70575781 in words is "seventy million, five hundred seventy-five thousand, seven hundred eighty-one".