51431486 has 4 divisors (see below), whose sum is σ = 77147232. Its totient is φ = 25715742.

The previous prime is 51431467. The next prime is 51431503. The reversal of 51431486 is 68413415.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12857870 + ... + 12857873.

It is an arithmetic number, because the mean of its divisors is an integer number (19286808).

Almost surely, 2^51431486 is an apocalyptic number.

51431486 is a deficient number, since it is larger than the sum of its proper divisors (25715746).

51431486 is a wasteful number, since it uses less digits than its factorization.

51431486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25715745.

The product of its digits is 11520, while the sum is 32.

The square root of 51431486 is about 7171.5748619114. The cubic root of 51431486 is about 371.8858814790.

The spelling of 51431486 in words is "fifty-one million, four hundred thirty-one thousand, four hundred eighty-six".