51689501 has 4 divisors (see below), whose sum is σ = 51717600. Its totient is φ = 51661404.

The previous prime is 51689497. The next prime is 51689527. The reversal of 51689501 is 10598615.

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 51689501 - 2² = 51689497 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51689531) 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, 11081 + ... + 15038.

It is an arithmetic number, because the mean of its divisors is an integer number (12929400).

Almost surely, 2^51689501 is an apocalyptic number.

It is an amenable number.

51689501 is a deficient number, since it is larger than the sum of its proper divisors (28099).

51689501 is a wasteful number, since it uses less digits than its factorization.

51689501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28098.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 51689501 is about 7189.5410841027. The cubic root of 51689501 is about 372.5067211976.

The spelling of 51689501 in words is "fifty-one million, six hundred eighty-nine thousand, five hundred one".