51218349 has 32 divisors (see below), whose sum is σ = 84639744. Its totient is φ = 26827200.

The previous prime is 51218347. The next prime is 51218359. The reversal of 51218349 is 94381215.

It is not a de Polignac number, because 51218349 - 2¹ = 51218347 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51218341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43924 + ... + 45074.

It is an arithmetic number, because the mean of its divisors is an integer number (2644992).

Almost surely, 2^51218349 is an apocalyptic number.

It is an amenable number.

51218349 is a deficient number, since it is larger than the sum of its proper divisors (33421395).

51218349 is a wasteful number, since it uses less digits than its factorization.

51218349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337.

The product of its digits is 8640, while the sum is 33.

The square root of 51218349 is about 7156.6995884975. The cubic root of 51218349 is about 371.3714599918.

The spelling of 51218349 in words is "fifty-one million, two hundred eighteen thousand, three hundred forty-nine".