51489549 has 12 divisors (see below), whose sum is σ = 78748956. Its totient is φ = 32307072.

The previous prime is 51489539. The next prime is 51489623. The reversal of 51489549 is 94598415.

51489549 is a `hidden beast` number, since 514 + 8 + 95 + 49 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 33698025 + 17791524 = 5805^2 + 4218^2 .

It is not a de Polignac number, because 51489549 - 2⁵ = 51489517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51489509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168114 + ... + 168419.

It is an arithmetic number, because the mean of its divisors is an integer number (6562413).

Almost surely, 2^51489549 is an apocalyptic number.

It is an amenable number.

51489549 is a deficient number, since it is larger than the sum of its proper divisors (27259407).

51489549 is a wasteful number, since it uses less digits than its factorization.

51489549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336556 (or 336553 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 51489549 is about 7175.6218545851. The cubic root of 51489549 is about 372.0257743154.

The spelling of 51489549 in words is "fifty-one million, four hundred eighty-nine thousand, five hundred forty-nine".