51659149 has 4 divisors (see below), whose sum is σ = 51724764. Its totient is φ = 51593536.

The previous prime is 51659143. The next prime is 51659159. The reversal of 51659149 is 94195615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94195615 = 5 ⋅18839123.

It can be written as a sum of positive squares in 2 ways, for example, as 20187049 + 31472100 = 4493^2 + 5610^2 .

It is a cyclic number.

It is not a de Polignac number, because 51659149 - 2⁷ = 51659021 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 (51659143) 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, 31612 + ... + 33205.

It is an arithmetic number, because the mean of its divisors is an integer number (12931191).

Almost surely, 2^51659149 is an apocalyptic number.

It is an amenable number.

51659149 is a deficient number, since it is larger than the sum of its proper divisors (65615).

51659149 is an equidigital number, since it uses as much as digits as its factorization.

51659149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65614.

The product of its digits is 48600, while the sum is 40.

The square root of 51659149 is about 7187.4299300932. The cubic root of 51659149 is about 372.4337951196.

The spelling of 51659149 in words is "fifty-one million, six hundred fifty-nine thousand, one hundred forty-nine".