51042553 has 4 divisors (see below), whose sum is σ = 51110388. Its totient is φ = 50974720.

The previous prime is 51042547. The next prime is 51042571. The reversal of 51042553 is 35524015.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20539024 + 30503529 = 4532^2 + 5523^2 .

It is a cyclic number.

It is not a de Polignac number, because 51042553 - 2⁵ = 51042521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51042533) 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, 32776 + ... + 34297.

It is an arithmetic number, because the mean of its divisors is an integer number (12777597).

Almost surely, 2^51042553 is an apocalyptic number.

It is an amenable number.

51042553 is a deficient number, since it is larger than the sum of its proper divisors (67835).

51042553 is an equidigital number, since it uses as much as digits as its factorization.

51042553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67834.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 51042553 is about 7144.4071132600. The cubic root of 51042553 is about 370.9460886541.

Adding to 51042553 its reverse (35524015), we get a palindrome (86566568).

The spelling of 51042553 in words is "fifty-one million, forty-two thousand, five hundred fifty-three".