51045145 has 4 divisors (see below), whose sum is σ = 61254180. Its totient is φ = 40836112.

The previous prime is 51045143. The next prime is 51045157. The reversal of 51045145 is 54154015.

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: 54154015 = 5 ⋅10830803.

It can be written as a sum of positive squares in 2 ways, for example, as 23921881 + 27123264 = 4891^2 + 5208^2 .

It is a cyclic number.

It is not a de Polignac number, because 51045145 - 2¹ = 51045143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51045143) 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, 5104510 + ... + 5104519.

It is an arithmetic number, because the mean of its divisors is an integer number (15313545).

Almost surely, 2^51045145 is an apocalyptic number.

It is an amenable number.

51045145 is a deficient number, since it is larger than the sum of its proper divisors (10209035).

51045145 is a wasteful number, since it uses less digits than its factorization.

51045145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10209034.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 51045145 is about 7144.5885115939. The cubic root of 51045145 is about 370.9523675719.

The spelling of 51045145 in words is "fifty-one million, forty-five thousand, one hundred forty-five".