51918701 has 4 divisors (see below), whose sum is σ = 51933504. Its totient is φ = 51903900.

The previous prime is 51918689. The next prime is 51918703. The reversal of 51918701 is 10781915.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10781915 = 5 ⋅2156383.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51918701 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 (51918703) 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, 1166 + ... + 10256.

It is an arithmetic number, because the mean of its divisors is an integer number (12983376).

Almost surely, 2^51918701 is an apocalyptic number.

It is an amenable number.

51918701 is a deficient number, since it is larger than the sum of its proper divisors (14803).

51918701 is an equidigital number, since it uses as much as digits as its factorization.

51918701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14802.

The product of its (nonzero) digits is 2520, while the sum is 32.

The square root of 51918701 is about 7205.4632744883. The cubic root of 51918701 is about 373.0564953587.

The spelling of 51918701 in words is "fifty-one million, nine hundred eighteen thousand, seven hundred one".