2051739686 has 4 divisors (see below), whose sum is σ = 3077609532. Its totient is φ = 1025869842.

The previous prime is 2051739667. The next prime is 2051739721. The reversal of 2051739686 is 6869371502.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2051739686.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512934920 + ... + 512934923.

It is an arithmetic number, because the mean of its divisors is an integer number (769402383).

Almost surely, 2^2051739686 is an apocalyptic number.

2051739686 is a deficient number, since it is larger than the sum of its proper divisors (1025869846).

2051739686 is a wasteful number, since it uses less digits than its factorization.

2051739686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025869845.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 2051739686 is about 45296.1332345268. The cubic root of 2051739686 is about 1270.6933379075.

The spelling of 2051739686 in words is "two billion, fifty-one million, seven hundred thirty-nine thousand, six hundred eighty-six".