51212147 has 4 divisors (see below), whose sum is σ = 58528176. Its totient is φ = 43896120.

The previous prime is 51212137. The next prime is 51212159. The reversal of 51212147 is 74121215.

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 51212147 - 2⁴ = 51212131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51212137) 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, 3658004 + ... + 3658017.

It is an arithmetic number, because the mean of its divisors is an integer number (14632044).

Almost surely, 2^51212147 is an apocalyptic number.

51212147 is a deficient number, since it is larger than the sum of its proper divisors (7316029).

51212147 is an equidigital number, since it uses as much as digits as its factorization.

51212147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7316028.

The product of its digits is 560, while the sum is 23.

The square root of 51212147 is about 7156.2662750907. The cubic root of 51212147 is about 371.3564696689.

The spelling of 51212147 in words is "fifty-one million, two hundred twelve thousand, one hundred forty-seven".