51458985 has 24 divisors (see below), whose sum is σ = 90122760. Its totient is φ = 27159552.

The previous prime is 51458969. The next prime is 51458987. The reversal of 51458985 is 58985415.

It is a happy number.

51458985 is a `hidden beast` number, since 514 + 58 + 9 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7056 + 51451929 = 84^2 + 7173^2 .

It is not a de Polignac number, because 51458985 - 2⁴ = 51458969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51458985.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51458987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1530 + ... + 10259.

It is an arithmetic number, because the mean of its divisors is an integer number (3755115).

Almost surely, 2^51458985 is an apocalyptic number.

It is an amenable number.

51458985 is a deficient number, since it is larger than the sum of its proper divisors (38663775).

51458985 is a wasteful number, since it uses less digits than its factorization.

51458985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11897 (or 11894 counting only the distinct ones).

The product of its digits is 288000, while the sum is 45.

The square root of 51458985 is about 7173.4918275551. The cubic root of 51458985 is about 371.9521487184.

The spelling of 51458985 in words is "fifty-one million, four hundred fifty-eight thousand, nine hundred eighty-five".