51494399 has 4 divisors (see below), whose sum is σ = 56175720. Its totient is φ = 46813080.

The previous prime is 51494393. The next prime is 51494413. The reversal of 51494399 is 99349415.

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 51494399 - 2¹⁶ = 51428863 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 (51494393) 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, 2340644 + ... + 2340665.

It is an arithmetic number, because the mean of its divisors is an integer number (14043930).

Almost surely, 2^51494399 is an apocalyptic number.

51494399 is a deficient number, since it is larger than the sum of its proper divisors (4681321).

51494399 is a wasteful number, since it uses less digits than its factorization.

51494399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681320.

The product of its digits is 174960, while the sum is 44.

The square root of 51494399 is about 7175.9597964314. The cubic root of 51494399 is about 372.0374547981.

The spelling of 51494399 in words is "fifty-one million, four hundred ninety-four thousand, three hundred ninety-nine".