51513953 has 4 divisors (see below), whose sum is σ = 52906260. Its totient is φ = 50121648.

The previous prime is 51513949. The next prime is 51513977. The reversal of 51513953 is 35931515.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35931515 = 5 ⋅7186303.

It can be written as a sum of positive squares in 2 ways, for example, as 45792289 + 5721664 = 6767^2 + 2392^2 .

It is a cyclic number.

It is not a de Polignac number, because 51513953 - 2² = 51513949 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 (51513923) 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, 696098 + ... + 696171.

It is an arithmetic number, because the mean of its divisors is an integer number (13226565).

Almost surely, 2^51513953 is an apocalyptic number.

It is an amenable number.

51513953 is a deficient number, since it is larger than the sum of its proper divisors (1392307).

51513953 is a wasteful number, since it uses less digits than its factorization.

51513953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392306.

The product of its digits is 10125, while the sum is 32.

The square root of 51513953 is about 7177.3221329407. The cubic root of 51513953 is about 372.0845401764.

The spelling of 51513953 in words is "fifty-one million, five hundred thirteen thousand, nine hundred fifty-three".