57216197 has 12 divisors (see below), whose sum is σ = 59402148. Its totient is φ = 55104000.

The previous prime is 57216193. The next prime is 57216209. The reversal of 57216197 is 79161275.

It can be written as a sum of positive squares in 6 ways, for example, as 8300161 + 48916036 = 2881^2 + 6994^2 .

It is not a de Polignac number, because 57216197 - 2² = 57216193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57216197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57216193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169613 + ... + 169949.

It is an arithmetic number, because the mean of its divisors is an integer number (4950179).

Almost surely, 2^57216197 is an apocalyptic number.

It is an amenable number.

57216197 is a deficient number, since it is larger than the sum of its proper divisors (2185951).

57216197 is a wasteful number, since it uses less digits than its factorization.

57216197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 479 counting only the distinct ones).

The product of its digits is 26460, while the sum is 38.

The square root of 57216197 is about 7564.1388802692. The cubic root of 57216197 is about 385.3360690697.

The spelling of 57216197 in words is "fifty-seven million, two hundred sixteen thousand, one hundred ninety-seven".