51689489 has 4 divisors (see below), whose sum is σ = 51917424. Its totient is φ = 51461556.

The previous prime is 51689471. The next prime is 51689497. The reversal of 51689489 is 98498615.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51689489 - 2¹⁶ = 51623953 is a prime.

It is a super-2 number, since 2×51689489² = 5343606546162242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51689189) 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, 113627 + ... + 114080.

It is an arithmetic number, because the mean of its divisors is an integer number (12979356).

Almost surely, 2^51689489 is an apocalyptic number.

It is an amenable number.

51689489 is a deficient number, since it is larger than the sum of its proper divisors (227935).

51689489 is a wasteful number, since it uses less digits than its factorization.

51689489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227934.

The product of its digits is 622080, while the sum is 50.

The square root of 51689489 is about 7189.5402495570. The cubic root of 51689489 is about 372.5066923711.

The spelling of 51689489 in words is "fifty-one million, six hundred eighty-nine thousand, four hundred eighty-nine".