51011551 has 8 divisors (see below), whose sum is σ = 53408880. Its totient is φ = 48656832.

The previous prime is 51011549. The next prime is 51011557. The reversal of 51011551 is 15511015.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51011551 - 2¹ = 51011549 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 (51011557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8190 + ... + 13003.

It is an arithmetic number, because the mean of its divisors is an integer number (6676110).

Almost surely, 2^51011551 is an apocalyptic number.

51011551 is a deficient number, since it is larger than the sum of its proper divisors (2397329).

51011551 is a wasteful number, since it uses less digits than its factorization.

51011551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21305.

The product of its (nonzero) digits is 125, while the sum is 19.

The square root of 51011551 is about 7142.2371145181. The cubic root of 51011551 is about 370.8709722460.

Adding to 51011551 its reverse (15511015), we get a palindrome (66522566).

The spelling of 51011551 in words is "fifty-one million, eleven thousand, five hundred fifty-one".