521542197 has 24 divisors (see below), whose sum is σ = 824498688. Its totient is φ = 315057600.

The previous prime is 521542193. The next prime is 521542199. The reversal of 521542197 is 791245125.

521542197 is a `hidden beast` number, since 5 + 21 + 542 + 1 + 97 = 666.

It is not a de Polignac number, because 521542197 - 2² = 521542193 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521542193) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22572 + ... + 39402.

It is an arithmetic number, because the mean of its divisors is an integer number (34354112).

Almost surely, 2^521542197 is an apocalyptic number.

It is an amenable number.

521542197 is a deficient number, since it is larger than the sum of its proper divisors (302956491).

521542197 is a wasteful number, since it uses less digits than its factorization.

521542197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17161 (or 17158 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 521542197 is about 22837.2983734942. The cubic root of 521542197 is about 804.9393352173.

The spelling of 521542197 in words is "five hundred twenty-one million, five hundred forty-two thousand, one hundred ninety-seven".