51510551 has 4 divisors (see below), whose sum is σ = 51666504. Its totient is φ = 51354600.

The previous prime is 51510533. The next prime is 51510581. The reversal of 51510551 is 15501515.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51510551 - 2¹⁰ = 51509527 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 (51510581) 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, 77480 + ... + 78141.

It is an arithmetic number, because the mean of its divisors is an integer number (12916626).

Almost surely, 2^51510551 is an apocalyptic number.

51510551 is a deficient number, since it is larger than the sum of its proper divisors (155953).

51510551 is a wasteful number, since it uses less digits than its factorization.

51510551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155952.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 51510551 is about 7177.0851325590. The cubic root of 51510551 is about 372.0763491304.

The spelling of 51510551 in words is "fifty-one million, five hundred ten thousand, five hundred fifty-one".