197215825 has 12 divisors (see below), whose sum is σ = 244722060. Its totient is φ = 157660160.

The previous prime is 197215813. The next prime is 197215871. The reversal of 197215825 is 528512791.

It can be written as a sum of positive squares in 6 ways, for example, as 32581264 + 164634561 = 5708^2 + 12831^2 .

It is not a de Polignac number, because 197215825 - 2¹⁵ = 197183057 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64941 + ... + 67909.

It is an arithmetic number, because the mean of its divisors is an integer number (20393505).

Almost surely, 2^197215825 is an apocalyptic number.

It is an amenable number.

197215825 is a deficient number, since it is larger than the sum of its proper divisors (47506235).

197215825 is a wasteful number, since it uses less digits than its factorization.

197215825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5636 (or 5631 counting only the distinct ones).

The product of its digits is 50400, while the sum is 40.

The square root of 197215825 is about 14043.3551902670. The cubic root of 197215825 is about 582.0771981457.

The spelling of 197215825 in words is "one hundred ninety-seven million, two hundred fifteen thousand, eight hundred twenty-five".