51691486 has 32 divisors (see below), whose sum is σ = 97604352. Its totient is φ = 19944960.

The previous prime is 51691463. The next prime is 51691499. The reversal of 51691486 is 68419615.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14910 + ... + 18046.

It is an arithmetic number, because the mean of its divisors is an integer number (3050136).

Almost surely, 2^51691486 is an apocalyptic number.

51691486 is a deficient number, since it is larger than the sum of its proper divisors (45912866).

51691486 is a wasteful number, since it uses less digits than its factorization.

51691486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264.

The product of its digits is 51840, while the sum is 40.

The square root of 51691486 is about 7189.6791305315. The cubic root of 51691486 is about 372.5114895184.

The spelling of 51691486 in words is "fifty-one million, six hundred ninety-one thousand, four hundred eighty-six".