51863197 has 8 divisors (see below), whose sum is σ = 52684632. Its totient is φ = 51048000.

The previous prime is 51863191. The next prime is 51863249. The reversal of 51863197 is 79136815.

It can be written as a sum of positive squares in 4 ways, for example, as 109561 + 51753636 = 331^2 + 7194^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51863197 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 (51863191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16863 + ... + 19699.

It is an arithmetic number, because the mean of its divisors is an integer number (6585579).

Almost surely, 2^51863197 is an apocalyptic number.

It is an amenable number.

51863197 is a deficient number, since it is larger than the sum of its proper divisors (821435).

51863197 is a wasteful number, since it uses less digits than its factorization.

51863197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119.

The product of its digits is 45360, while the sum is 40.

The square root of 51863197 is about 7201.6107226092. The cubic root of 51863197 is about 372.9235085262.

The spelling of 51863197 in words is "fifty-one million, eight hundred sixty-three thousand, one hundred ninety-seven".