51213047 has 2 divisors, whose sum is σ = 51213048. Its totient is φ = 51213046.

The previous prime is 51213031. The next prime is 51213049. The reversal of 51213047 is 74031215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51213047 - 2⁴ = 51213031 is a prime.

Together with 51213049, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51213049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25606523 + 25606524.

It is an arithmetic number, because the mean of its divisors is an integer number (25606524).

Almost surely, 2^51213047 is an apocalyptic number.

51213047 is a deficient number, since it is larger than the sum of its proper divisors (1).

51213047 is an equidigital number, since it uses as much as digits as its factorization.

51213047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 51213047 is about 7156.3291567675. The cubic root of 51213047 is about 371.3586450569.

The spelling of 51213047 in words is "fifty-one million, two hundred thirteen thousand, forty-seven".