51019901 has 4 divisors (see below), whose sum is σ = 51034332. Its totient is φ = 51005472.

The previous prime is 51019889. The next prime is 51019931. The reversal of 51019901 is 10991015.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14707225 + 36312676 = 3835^2 + 6026^2 .

It is a cyclic number.

It is not a de Polignac number, because 51019901 - 2¹⁴ = 51003517 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 (51019931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081 + ... + 10313.

It is an arithmetic number, because the mean of its divisors is an integer number (12758583).

Almost surely, 2^51019901 is an apocalyptic number.

It is an amenable number.

51019901 is a deficient number, since it is larger than the sum of its proper divisors (14431).

51019901 is an equidigital number, since it uses as much as digits as its factorization.

51019901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14430.

The product of its (nonzero) digits is 405, while the sum is 26.

The square root of 51019901 is about 7142.8216413403. The cubic root of 51019901 is about 370.8912069027.

The spelling of 51019901 in words is "fifty-one million, nineteen thousand, nine hundred one".