70390561 has 2 divisors, whose sum is σ = 70390562. Its totient is φ = 70390560.

The previous prime is 70390559. The next prime is 70390571. The reversal of 70390561 is 16509307.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50140561 + 20250000 = 7081^2 + 4500^2 .

It is a cyclic number.

It is not a de Polignac number, because 70390561 - 2¹ = 70390559 is a prime.

Together with 70390559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (70390531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35195280 + 35195281.

It is an arithmetic number, because the mean of its divisors is an integer number (35195281).

Almost surely, 2^70390561 is an apocalyptic number.

It is an amenable number.

70390561 is a deficient number, since it is larger than the sum of its proper divisors (1).

70390561 is an equidigital number, since it uses as much as digits as its factorization.

70390561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 70390561 is about 8389.9082831697. The cubic root of 70390561 is about 412.8935913956.

Adding to 70390561 its reverse (16509307), we get a palindrome (86899868).

The spelling of 70390561 in words is "seventy million, three hundred ninety thousand, five hundred sixty-one".