51421267 has 4 divisors (see below), whose sum is σ = 51440080. Its totient is φ = 51402456.

The previous prime is 51421259. The next prime is 51421283. The reversal of 51421267 is 76212415.

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 51421267 - 2³ = 51421259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51421217) 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, 4428 + ... + 11065.

It is an arithmetic number, because the mean of its divisors is an integer number (12860020).

Almost surely, 2^51421267 is an apocalyptic number.

51421267 is a deficient number, since it is larger than the sum of its proper divisors (18813).

51421267 is a wasteful number, since it uses less digits than its factorization.

51421267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18812.

The product of its digits is 3360, while the sum is 28.

The square root of 51421267 is about 7170.8623609717. The cubic root of 51421267 is about 371.8612496575.

The spelling of 51421267 in words is "fifty-one million, four hundred twenty-one thousand, two hundred sixty-seven".