51551103 has 4 divisors (see below), whose sum is σ = 68734808. Its totient is φ = 34367400.

The previous prime is 51551099. The next prime is 51551111. The reversal of 51551103 is 30115515.

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

It is not a de Polignac number, because 51551103 - 2² = 51551099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51551103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51551113) 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, 8591848 + ... + 8591853.

It is an arithmetic number, because the mean of its divisors is an integer number (17183702).

Almost surely, 2^51551103 is an apocalyptic number.

51551103 is a deficient number, since it is larger than the sum of its proper divisors (17183705).

51551103 is a wasteful number, since it uses less digits than its factorization.

51551103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17183704.

The product of its (nonzero) digits is 375, while the sum is 21.

The square root of 51551103 is about 7179.9096790976. The cubic root of 51551103 is about 372.1739633218.

Adding to 51551103 its reverse (30115515), we get a palindrome (81666618).

It can be divided in two parts, 51 and 551103, that multiplied together give a triangular number (28106253 = T₇₄₉₇).

The spelling of 51551103 in words is "fifty-one million, five hundred fifty-one thousand, one hundred three".