51918969 has 8 divisors (see below), whose sum is σ = 73297440. Its totient is φ = 32576576.

The previous prime is 51918967. The next prime is 51919013. The reversal of 51918969 is 96981915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51918969 - 2¹ = 51918967 is a prime.

It is a super-2 number, since 2×51918969² = 5391158684045922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51918967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508959 + ... + 509060.

It is an arithmetic number, because the mean of its divisors is an integer number (9162180).

Almost surely, 2^51918969 is an apocalyptic number.

It is an amenable number.

51918969 is a deficient number, since it is larger than the sum of its proper divisors (21378471).

51918969 is a wasteful number, since it uses less digits than its factorization.

51918969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018039.

The product of its digits is 174960, while the sum is 48.

The square root of 51918969 is about 7205.4818714643. The cubic root of 51918969 is about 373.0571372531.

The spelling of 51918969 in words is "fifty-one million, nine hundred eighteen thousand, nine hundred sixty-nine".