51535601 has 4 divisors (see below), whose sum is σ = 55499892. Its totient is φ = 47571312.

The previous prime is 51535559. The next prime is 51535607. The reversal of 51535601 is 10653515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10653515 = 5 ⋅2130703.

It can be written as a sum of positive squares in 2 ways, for example, as 35343025 + 16192576 = 5945^2 + 4024^2 .

It is a cyclic number.

It is not a de Polignac number, because 51535601 - 2⁶ = 51535537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51535607) 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, 1982126 + ... + 1982151.

It is an arithmetic number, because the mean of its divisors is an integer number (13874973).

Almost surely, 2^51535601 is an apocalyptic number.

It is an amenable number.

51535601 is a deficient number, since it is larger than the sum of its proper divisors (3964291).

51535601 is a wasteful number, since it uses less digits than its factorization.

51535601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964290.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 51535601 is about 7178.8300578855. The cubic root of 51535601 is about 372.1366539410.

The spelling of 51535601 in words is "fifty-one million, five hundred thirty-five thousand, six hundred one".