51801938 has 8 divisors (see below), whose sum is σ = 78097932. Its totient is φ = 25769296.

The previous prime is 51801929. The next prime is 51801947. The reversal of 51801938 is 83910815.

It is an interprime number because it is at equal distance from previous prime (51801929) and next prime (51801947).

It can be written as a sum of positive squares in 2 ways, for example, as 34304449 + 17497489 = 5857^2 + 4183^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 51801898 and 51801907.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65345 + ... + 66132.

Almost surely, 2^51801938 is an apocalyptic number.

51801938 is a deficient number, since it is larger than the sum of its proper divisors (26295994).

51801938 is a wasteful number, since it uses less digits than its factorization.

51801938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131676.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 51801938 is about 7197.3563202054. The cubic root of 51801938 is about 372.7766225970.

The spelling of 51801938 in words is "fifty-one million, eight hundred one thousand, nine hundred thirty-eight".