51387494 has 12 divisors (see below), whose sum is σ = 78975996. Its totient is φ = 25063752.

The previous prime is 51387397. The next prime is 51387509. The reversal of 51387494 is 49478315.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66092 + ... + 66864.

It is an arithmetic number, because the mean of its divisors is an integer number (6581333).

Almost surely, 2^51387494 is an apocalyptic number.

51387494 is a deficient number, since it is larger than the sum of its proper divisors (27588502).

51387494 is an frugal number, since it uses more digits than its factorization.

51387494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591 (or 818 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 51387494 is about 7168.5070970182. The cubic root of 51387494 is about 371.7798201814.

The spelling of 51387494 in words is "fifty-one million, three hundred eighty-seven thousand, four hundred ninety-four".