70505917 has 2 divisors, whose sum is σ = 70505918. Its totient is φ = 70505916.

The previous prime is 70505881. The next prime is 70505933. The reversal of 70505917 is 71950507.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48734361 + 21771556 = 6981^2 + 4666^2 .

It is a cyclic number.

It is not a de Polignac number, because 70505917 - 2¹¹ = 70503869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70505947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35252958 + 35252959.

It is an arithmetic number, because the mean of its divisors is an integer number (35252959).

Almost surely, 2^70505917 is an apocalyptic number.

It is an amenable number.

70505917 is a deficient number, since it is larger than the sum of its proper divisors (1).

70505917 is an equidigital number, since it uses as much as digits as its factorization.

70505917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11025, while the sum is 34.

The square root of 70505917 is about 8396.7801567029. The cubic root of 70505917 is about 413.1190182027.

The spelling of 70505917 in words is "seventy million, five hundred five thousand, nine hundred seventeen".