70138609 has 2 divisors, whose sum is σ = 70138610. Its totient is φ = 70138608.

The previous prime is 70138603. The next prime is 70138631. The reversal of 70138609 is 90683107.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67897600 + 2241009 = 8240^2 + 1497^2 .

It is a cyclic number.

It is not a de Polignac number, because 70138609 - 2⁹ = 70138097 is a prime.

It is not a weakly prime, because it can be changed into another prime (70138603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35069304 + 35069305.

It is an arithmetic number, because the mean of its divisors is an integer number (35069305).

Almost surely, 2^70138609 is an apocalyptic number.

It is an amenable number.

70138609 is a deficient number, since it is larger than the sum of its proper divisors (1).

70138609 is an equidigital number, since it uses as much as digits as its factorization.

70138609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 70138609 is about 8374.8796409262. The cubic root of 70138609 is about 412.4003731240.

The spelling of 70138609 in words is "seventy million, one hundred thirty-eight thousand, six hundred nine".