51488494 has 4 divisors (see below), whose sum is σ = 77232744. Its totient is φ = 25744246.

The previous prime is 51488491. The next prime is 51488509. The reversal of 51488494 is 49488415.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51488494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51488491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12872122 + ... + 12872125.

It is an arithmetic number, because the mean of its divisors is an integer number (19308186).

Almost surely, 2^51488494 is an apocalyptic number.

51488494 is a deficient number, since it is larger than the sum of its proper divisors (25744250).

51488494 is a wasteful number, since it uses less digits than its factorization.

51488494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25744249.

The product of its digits is 184320, while the sum is 43.

The square root of 51488494 is about 7175.5483414161. The cubic root of 51488494 is about 372.0232334123.

The spelling of 51488494 in words is "fifty-one million, four hundred eighty-eight thousand, four hundred ninety-four".