65215117 has 4 divisors (see below), whose sum is σ = 71143776. Its totient is φ = 59286460.

The previous prime is 65215099. The next prime is 65215121. The reversal of 65215117 is 71151256.

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.

It is a cyclic number.

It is not a de Polignac number, because 65215117 - 2²³ = 56826509 is a prime.

It is a super-2 number, since 2×65215117² = 8506022970647378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65215147) 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, 2964313 + ... + 2964334.

It is an arithmetic number, because the mean of its divisors is an integer number (17785944).

Almost surely, 2^65215117 is an apocalyptic number.

It is an amenable number.

65215117 is a deficient number, since it is larger than the sum of its proper divisors (5928659).

65215117 is a wasteful number, since it uses less digits than its factorization.

65215117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5928658.

The product of its digits is 2100, while the sum is 28.

The square root of 65215117 is about 8075.5877185503. The cubic root of 65215117 is about 402.5156394782.

The spelling of 65215117 in words is "sixty-five million, two hundred fifteen thousand, one hundred seventeen".