51981103 has 4 divisors (see below), whose sum is σ = 52001640. Its totient is φ = 51960568.

The previous prime is 51981067. The next prime is 51981151. The reversal of 51981103 is 30118915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30118915 = 5 ⋅6023783.

It is a cyclic number.

It is not a de Polignac number, because 51981103 - 2¹³ = 51972911 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 (51981703) 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, 5833 + ... + 11746.

It is an arithmetic number, because the mean of its divisors is an integer number (13000410).

Almost surely, 2^51981103 is an apocalyptic number.

51981103 is a deficient number, since it is larger than the sum of its proper divisors (20537).

51981103 is a wasteful number, since it uses less digits than its factorization.

51981103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20536.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 51981103 is about 7209.7921606659. The cubic root of 51981103 is about 373.2058965733.

The spelling of 51981103 in words is "fifty-one million, nine hundred eighty-one thousand, one hundred three".