51231442394 has 48 divisors (see below), whose sum is σ = 86738089248. Its totient is φ = 22506372000.

The previous prime is 51231442343. The next prime is 51231442429. The reversal of 51231442394 is 49324413215.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27293384 + ... + 27295260.

It is an arithmetic number, because the mean of its divisors is an integer number (1807043526).

Almost surely, 2^51231442394 is an apocalyptic number.

51231442394 is a deficient number, since it is larger than the sum of its proper divisors (35506646854).

51231442394 is a wasteful number, since it uses less digits than its factorization.

51231442394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243 (or 3212 counting only the distinct ones).

The product of its digits is 103680, while the sum is 38.

The spelling of 51231442394 in words is "fifty-one billion, two hundred thirty-one million, four hundred forty-two thousand, three hundred ninety-four".