51547387 has 4 divisors (see below), whose sum is σ = 51774696. Its totient is φ = 51320080.

The previous prime is 51547369. The next prime is 51547459. The reversal of 51547387 is 78374515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78374515 = 5 ⋅15674903.

It is a cyclic number.

It is not a de Polignac number, because 51547387 - 2⁷ = 51547259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51547337) 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, 113314 + ... + 113767.

It is an arithmetic number, because the mean of its divisors is an integer number (12943674).

Almost surely, 2^51547387 is an apocalyptic number.

51547387 is a deficient number, since it is larger than the sum of its proper divisors (227309).

51547387 is a wasteful number, since it uses less digits than its factorization.

51547387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227308.

The product of its digits is 117600, while the sum is 40.

The square root of 51547387 is about 7179.6508968055. The cubic root of 51547387 is about 372.1650205343.

The spelling of 51547387 in words is "fifty-one million, five hundred forty-seven thousand, three hundred eighty-seven".