51380947 has 4 divisors (see below), whose sum is σ = 51483600. Its totient is φ = 51278296.

The previous prime is 51380941. The next prime is 51380963. The reversal of 51380947 is 74908315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74908315 = 5 ⋅14981663.

It is a cyclic number.

It is not a de Polignac number, because 51380947 - 2³ = 51380939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51380941) 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, 50572 + ... + 51577.

It is an arithmetic number, because the mean of its divisors is an integer number (12870900).

Almost surely, 2^51380947 is an apocalyptic number.

51380947 is a deficient number, since it is larger than the sum of its proper divisors (102653).

51380947 is a wasteful number, since it uses less digits than its factorization.

51380947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102652.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 51380947 is about 7168.0504323003. The cubic root of 51380947 is about 371.7640306986.

The spelling of 51380947 in words is "fifty-one million, three hundred eighty thousand, nine hundred forty-seven".