51495553 has 4 divisors (see below), whose sum is σ = 52693168. Its totient is φ = 50297940.

The previous prime is 51495547. The next prime is 51495581. The reversal of 51495553 is 35559415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51495553 - 2¹³ = 51487361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51495523) 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, 598743 + ... + 598828.

It is an arithmetic number, because the mean of its divisors is an integer number (13173292).

Almost surely, 2^51495553 is an apocalyptic number.

It is an amenable number.

51495553 is a deficient number, since it is larger than the sum of its proper divisors (1197615).

51495553 is a wasteful number, since it uses less digits than its factorization.

51495553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197614.

The product of its digits is 67500, while the sum is 37.

The square root of 51495553 is about 7176.0402033433. The cubic root of 51495553 is about 372.0402339225.

The spelling of 51495553 in words is "fifty-one million, four hundred ninety-five thousand, five hundred fifty-three".