51081693 has 16 divisors (see below), whose sum is σ = 74039616. Its totient is φ = 31138560.

The previous prime is 51081691. The next prime is 51081703. The reversal of 51081693 is 39618015.

It is not a de Polignac number, because 51081693 - 2¹ = 51081691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51081691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1948 + ... + 10293.

It is an arithmetic number, because the mean of its divisors is an integer number (4627476).

Almost surely, 2^51081693 is an apocalyptic number.

It is an amenable number.

51081693 is a deficient number, since it is larger than the sum of its proper divisors (22957923).

51081693 is a wasteful number, since it uses less digits than its factorization.

51081693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12364.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 51081693 is about 7147.1457939516. The cubic root of 51081693 is about 371.0408796312.

The spelling of 51081693 in words is "fifty-one million, eighty-one thousand, six hundred ninety-three".