51668919 has 6 divisors (see below), whose sum is σ = 74632896. Its totient is φ = 34445940.

The previous prime is 51668917. The next prime is 51668921. The reversal of 51668919 is 91986615.

It is an interprime number because it is at equal distance from previous prime (51668917) and next prime (51668921).

It is not a de Polignac number, because 51668919 - 2¹ = 51668917 is a prime.

It is a super-2 number, since 2×51668919² = 5339354381257122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51668917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2870487 + ... + 2870504.

It is an arithmetic number, because the mean of its divisors is an integer number (12438816).

Almost surely, 2^51668919 is an apocalyptic number.

51668919 is a deficient number, since it is larger than the sum of its proper divisors (22963977).

51668919 is a wasteful number, since it uses less digits than its factorization.

51668919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5740997 (or 5740994 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 51668919 is about 7188.1095567611. The cubic root of 51668919 is about 372.4572723989.

The spelling of 51668919 in words is "fifty-one million, six hundred sixty-eight thousand, nine hundred nineteen".