70447081 has 2 divisors, whose sum is σ = 70447082. Its totient is φ = 70447080.

The previous prime is 70447073. The next prime is 70447141. The reversal of 70447081 is 18074407.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48441600 + 22005481 = 6960^2 + 4691^2 .

It is a cyclic number.

It is not a de Polignac number, because 70447081 - 2³ = 70447073 is a prime.

It is a super-2 number, since 2×70447081² = 9925582442841122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (70447981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35223540 + 35223541.

It is an arithmetic number, because the mean of its divisors is an integer number (35223541).

Almost surely, 2^70447081 is an apocalyptic number.

It is an amenable number.

70447081 is a deficient number, since it is larger than the sum of its proper divisors (1).

70447081 is an equidigital number, since it uses as much as digits as its factorization.

70447081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 70447081 is about 8393.2759397032. The cubic root of 70447081 is about 413.0040726030.

The spelling of 70447081 in words is "seventy million, four hundred forty-seven thousand, eighty-one".