51197211 has 16 divisors (see below), whose sum is σ = 81682720. Its totient is φ = 31505760.

The previous prime is 51197207. The next prime is 51197221. The reversal of 51197211 is 11279115.

51197211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51197211 - 2² = 51197207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51197221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72580 + ... + 73281.

It is an arithmetic number, because the mean of its divisors is an integer number (5105170).

Almost surely, 2^51197211 is an apocalyptic number.

51197211 is a deficient number, since it is larger than the sum of its proper divisors (30485509).

51197211 is a wasteful number, since it uses less digits than its factorization.

51197211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145883 (or 145877 counting only the distinct ones).

The product of its digits is 630, while the sum is 27.

The square root of 51197211 is about 7155.2226380456. Note that the first 3 decimals coincide. The cubic root of 51197211 is about 371.3203641753.

The spelling of 51197211 in words is "fifty-one million, one hundred ninety-seven thousand, two hundred eleven".