51197867 has 4 divisors (see below), whose sum is σ = 58511856. Its totient is φ = 43883880.

The previous prime is 51197843. The next prime is 51197869. The reversal of 51197867 is 76879115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51197867 - 2⁸ = 51197611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51197869) 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, 3656984 + ... + 3656997.

It is an arithmetic number, because the mean of its divisors is an integer number (14627964).

Almost surely, 2^51197867 is an apocalyptic number.

51197867 is a deficient number, since it is larger than the sum of its proper divisors (7313989).

51197867 is an equidigital number, since it uses as much as digits as its factorization.

51197867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7313988.

The product of its digits is 105840, while the sum is 44.

The square root of 51197867 is about 7155.2684785408. The cubic root of 51197867 is about 371.3219501023.

The spelling of 51197867 in words is "fifty-one million, one hundred ninety-seven thousand, eight hundred sixty-seven".