51470861 has 4 divisors (see below), whose sum is σ = 55430172. Its totient is φ = 47511552.

The previous prime is 51470843. The next prime is 51470899. The reversal of 51470861 is 16807415.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16807415 = 5 ⋅3361483.

It can be written as a sum of positive squares in 2 ways, for example, as 2540836 + 48930025 = 1594^2 + 6995^2 .

It is a cyclic number.

It is not a de Polignac number, because 51470861 - 2¹⁴ = 51454477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51470821) 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, 1979636 + ... + 1979661.

It is an arithmetic number, because the mean of its divisors is an integer number (13857543).

Almost surely, 2^51470861 is an apocalyptic number.

It is an amenable number.

51470861 is a deficient number, since it is larger than the sum of its proper divisors (3959311).

51470861 is a wasteful number, since it uses less digits than its factorization.

51470861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959310.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 51470861 is about 7174.3195496158. The cubic root of 51470861 is about 371.9807602683.

The spelling of 51470861 in words is "fifty-one million, four hundred seventy thousand, eight hundred sixty-one".