51189649 has 16 divisors (see below), whose sum is σ = 60641280. Its totient is φ = 42284880.

The previous prime is 51189647. The next prime is 51189653. The reversal of 51189649 is 94698115.

It is a cyclic number.

It is not a de Polignac number, because 51189649 - 2¹ = 51189647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51189647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90642 + ... + 91204.

It is an arithmetic number, because the mean of its divisors is an integer number (3790080).

Almost surely, 2^51189649 is an apocalyptic number.

It is an amenable number.

51189649 is a deficient number, since it is larger than the sum of its proper divisors (9451631).

51189649 is a wasteful number, since it uses less digits than its factorization.

51189649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020.

The product of its digits is 77760, while the sum is 43.

The square root of 51189649 is about 7154.6941933251. The cubic root of 51189649 is about 371.3020815202.

The spelling of 51189649 in words is "fifty-one million, one hundred eighty-nine thousand, six hundred forty-nine".