51667989 has 8 divisors (see below), whose sum is σ = 68930400. Its totient is φ = 34425456.

The previous prime is 51667969. The next prime is 51668003. The reversal of 51667989 is 98976615.

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

It is not a de Polignac number, because 51667989 - 2¹⁷ = 51536917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51667909) 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, 2862 + ... + 10560.

It is an arithmetic number, because the mean of its divisors is an integer number (8616300).

Almost surely, 2^51667989 is an apocalyptic number.

It is an amenable number.

51667989 is a deficient number, since it is larger than the sum of its proper divisors (17262411).

51667989 is a wasteful number, since it uses less digits than its factorization.

51667989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9939.

The product of its digits is 816480, while the sum is 51.

The square root of 51667989 is about 7188.0448663040. The cubic root of 51667989 is about 372.4550377393.

The spelling of 51667989 in words is "fifty-one million, six hundred sixty-seven thousand, nine hundred eighty-nine".