51994015 has 4 divisors (see below), whose sum is σ = 62392824. Its totient is φ = 41595208.

The previous prime is 51994003. The next prime is 51994043. The reversal of 51994015 is 51049915.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51994015 - 2¹³ = 51985823 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 5199397 + ... + 5199406.

It is an arithmetic number, because the mean of its divisors is an integer number (15598206).

Almost surely, 2^51994015 is an apocalyptic number.

51994015 is a deficient number, since it is larger than the sum of its proper divisors (10398809).

51994015 is a wasteful number, since it uses less digits than its factorization.

51994015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10398808.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 51994015 is about 7210.6875539022. The cubic root of 51994015 is about 373.2367952097.

The spelling of 51994015 in words is "fifty-one million, nine hundred ninety-four thousand, fifteen".