70866391 has 2 divisors, whose sum is σ = 70866392. Its totient is φ = 70866390.

The previous prime is 70866377. The next prime is 70866413. The reversal of 70866391 is 19366807.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 70866391 - 2¹³ = 70858199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70866311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35433195 + 35433196.

It is an arithmetic number, because the mean of its divisors is an integer number (35433196).

Almost surely, 2^70866391 is an apocalyptic number.

70866391 is a deficient number, since it is larger than the sum of its proper divisors (1).

70866391 is an equidigital number, since it uses as much as digits as its factorization.

70866391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 70866391 is about 8418.2178042624. The cubic root of 70866391 is about 413.8218698152.

The spelling of 70866391 in words is "seventy million, eight hundred sixty-six thousand, three hundred ninety-one".