51243901 has 4 divisors (see below), whose sum is σ = 51260832. Its totient is φ = 51226972.

The previous prime is 51243889. The next prime is 51243911. The reversal of 51243901 is 10934215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51243901 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 (51243911) 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 3 ways as a sum of consecutive naturals, for example, 2545 + ... + 10438.

It is an arithmetic number, because the mean of its divisors is an integer number (12815208).

Almost surely, 2^51243901 is an apocalyptic number.

It is an amenable number.

51243901 is a deficient number, since it is larger than the sum of its proper divisors (16931).

51243901 is a wasteful number, since it uses less digits than its factorization.

51243901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16930.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 51243901 is about 7158.4845463268. The cubic root of 51243901 is about 371.4332067821.

It can be divided in two parts, 5124 and 3901, that added together give a square (9025 = 95²).

The spelling of 51243901 in words is "fifty-one million, two hundred forty-three thousand, nine hundred one".