51643145 has 8 divisors (see below), whose sum is σ = 62025480. Its totient is φ = 41278720.

The previous prime is 51643103. The next prime is 51643183. The reversal of 51643145 is 54134615.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1926544 + 49716601 = 1388^2 + 7051^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51643145 - 2¹⁴ = 51626761 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3011 + ... + 10599.

It is an arithmetic number, because the mean of its divisors is an integer number (7753185).

Almost surely, 2^51643145 is an apocalyptic number.

It is an amenable number.

51643145 is a deficient number, since it is larger than the sum of its proper divisors (10382335).

51643145 is a wasteful number, since it uses less digits than its factorization.

51643145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8955.

The product of its digits is 7200, while the sum is 29.

The square root of 51643145 is about 7186.3165112594. The cubic root of 51643145 is about 372.3953311612.

The spelling of 51643145 in words is "fifty-one million, six hundred forty-three thousand, one hundred forty-five".