51489763 has 4 divisors (see below), whose sum is σ = 55450528. Its totient is φ = 47529000.

The previous prime is 51489743. The next prime is 51489773. The reversal of 51489763 is 36798415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51489763 - 2⁵ = 51489731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51489743) 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, 1980363 + ... + 1980388.

It is an arithmetic number, because the mean of its divisors is an integer number (13862632).

Almost surely, 2^51489763 is an apocalyptic number.

51489763 is a deficient number, since it is larger than the sum of its proper divisors (3960765).

51489763 is a wasteful number, since it uses less digits than its factorization.

51489763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960764.

The product of its digits is 181440, while the sum is 43.

The square root of 51489763 is about 7175.6367661693. The cubic root of 51489763 is about 372.0262897172.

The spelling of 51489763 in words is "fifty-one million, four hundred eighty-nine thousand, seven hundred sixty-three".