70123517 has 4 divisors (see below), whose sum is σ = 70145760. Its totient is φ = 70101276.

The previous prime is 70123513. The next prime is 70123553. The reversal of 70123517 is 71532107.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71532107 = 17 ⋅4207771.

It is a cyclic number.

It is not a de Polignac number, because 70123517 - 2² = 70123513 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70123511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5417 + ... + 13022.

It is an arithmetic number, because the mean of its divisors is an integer number (17536440).

Almost surely, 2^70123517 is an apocalyptic number.

It is an amenable number.

70123517 is a deficient number, since it is larger than the sum of its proper divisors (22243).

70123517 is a wasteful number, since it uses less digits than its factorization.

70123517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22242.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 70123517 is about 8373.9785645773. The cubic root of 70123517 is about 412.3707917328.

The spelling of 70123517 in words is "seventy million, one hundred twenty-three thousand, five hundred seventeen".