70144639 has 2 divisors, whose sum is σ = 70144640. Its totient is φ = 70144638.

The previous prime is 70144631. The next prime is 70144667. The reversal of 70144639 is 93644107.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (93644107) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70144639 - 2³ = 70144631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70144631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35072319 + 35072320.

It is an arithmetic number, because the mean of its divisors is an integer number (35072320).

Almost surely, 2^70144639 is an apocalyptic number.

70144639 is a deficient number, since it is larger than the sum of its proper divisors (1).

70144639 is an equidigital number, since it uses as much as digits as its factorization.

70144639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 70144639 is about 8375.2396383626. The cubic root of 70144639 is about 412.4121911656.

The spelling of 70144639 in words is "seventy million, one hundred forty-four thousand, six hundred thirty-nine".