215117825 has 24 divisors (see below), whose sum is σ = 293397888. Its totient is φ = 155465280.

The previous prime is 215117809. The next prime is 215117839. The reversal of 215117825 is 528711512.

It is not a de Polignac number, because 215117825 - 2⁴ = 215117809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215117791 and 215117800.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8234 + ... + 22316.

It is an arithmetic number, because the mean of its divisors is an integer number (12224912).

Almost surely, 2^215117825 is an apocalyptic number.

215117825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215117825 is a deficient number, since it is larger than the sum of its proper divisors (78280063).

215117825 is a wasteful number, since it uses less digits than its factorization.

215117825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14153 (or 14148 counting only the distinct ones).

The product of its digits is 5600, while the sum is 32.

The square root of 215117825 is about 14666.8955474565. The cubic root of 215117825 is about 599.1820567511.

The spelling of 215117825 in words is "two hundred fifteen million, one hundred seventeen thousand, eight hundred twenty-five".