51512197 has 4 divisors (see below), whose sum is σ = 56195136. Its totient is φ = 46829260.

The previous prime is 51512189. The next prime is 51512233. The reversal of 51512197 is 79121515.

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 51512197 - 2³ = 51512189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51512107) 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, 2341453 + ... + 2341474.

It is an arithmetic number, because the mean of its divisors is an integer number (14048784).

Almost surely, 2^51512197 is an apocalyptic number.

It is an amenable number.

51512197 is a deficient number, since it is larger than the sum of its proper divisors (4682939).

51512197 is a wasteful number, since it uses less digits than its factorization.

51512197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682938.

The product of its digits is 3150, while the sum is 31.

The square root of 51512197 is about 7177.1998021513. The cubic root of 51512197 is about 372.0803122741.

The spelling of 51512197 in words is "fifty-one million, five hundred twelve thousand, one hundred ninety-seven".