51494459 has 4 divisors (see below), whose sum is σ = 53270160. Its totient is φ = 49718760.

The previous prime is 51494449. The next prime is 51494461. The reversal of 51494459 is 95449415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95449415 = 5 ⋅19089883.

It is not a de Polignac number, because 51494459 - 2¹² = 51490363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51494449) 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, 887807 + ... + 887864.

It is an arithmetic number, because the mean of its divisors is an integer number (13317540).

Almost surely, 2^51494459 is an apocalyptic number.

51494459 is a deficient number, since it is larger than the sum of its proper divisors (1775701).

51494459 is a wasteful number, since it uses less digits than its factorization.

51494459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775700.

The product of its digits is 129600, while the sum is 41.

The square root of 51494459 is about 7175.9639770556. The cubic root of 51494459 is about 372.0375992944.

The spelling of 51494459 in words is "fifty-one million, four hundred ninety-four thousand, four hundred fifty-nine".