70405261 has 2 divisors, whose sum is σ = 70405262. Its totient is φ = 70405260.

The previous prime is 70405229. The next prime is 70405267. The reversal of 70405261 is 16250407.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64304361 + 6100900 = 8019^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 70405261 - 2⁵ = 70405229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70405267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35202630 + 35202631.

It is an arithmetic number, because the mean of its divisors is an integer number (35202631).

Almost surely, 2^70405261 is an apocalyptic number.

It is an amenable number.

70405261 is a deficient number, since it is larger than the sum of its proper divisors (1).

70405261 is an equidigital number, since it uses as much as digits as its factorization.

70405261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 70405261 is about 8390.7842899219. The cubic root of 70405261 is about 412.9223315811.

Adding to 70405261 its reverse (16250407), we get a palindrome (86655668).

The spelling of 70405261 in words is "seventy million, four hundred five thousand, two hundred sixty-one".