51499394 has 8 divisors (see below), whose sum is σ = 77334348. Its totient is φ = 25721280.

The previous prime is 51499391. The next prime is 51499429. The reversal of 51499394 is 49399415.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51480625 + 18769 = 7175^2 + 137^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51499391) 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, 11867 + ... + 15614.

Almost surely, 2^51499394 is an apocalyptic number.

51499394 is a deficient number, since it is larger than the sum of its proper divisors (25834954).

51499394 is a wasteful number, since it uses less digits than its factorization.

51499394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28420.

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

The square root of 51499394 is about 7176.3078250588. The cubic root of 51499394 is about 372.0494837245.

The spelling of 51499394 in words is "fifty-one million, four hundred ninety-nine thousand, three hundred ninety-four".