70391617 has 2 divisors, whose sum is σ = 70391618. Its totient is φ = 70391616.

The previous prime is 70391609. The next prime is 70391627. The reversal of 70391617 is 71619307.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45481536 + 24910081 = 6744^2 + 4991^2 .

It is a cyclic number.

It is not a de Polignac number, because 70391617 - 2³ = 70391609 is a prime.

It is not a weakly prime, because it can be changed into another prime (70391627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35195808 + 35195809.

It is an arithmetic number, because the mean of its divisors is an integer number (35195809).

Almost surely, 2^70391617 is an apocalyptic number.

It is an amenable number.

70391617 is a deficient number, since it is larger than the sum of its proper divisors (1).

70391617 is an equidigital number, since it uses as much as digits as its factorization.

70391617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 70391617 is about 8389.9712156836. The cubic root of 70391617 is about 412.8956561301.

The spelling of 70391617 in words is "seventy million, three hundred ninety-one thousand, six hundred seventeen".