51540694 has 4 divisors (see below), whose sum is σ = 77311044. Its totient is φ = 25770346.

The previous prime is 51540691. The next prime is 51540707. The reversal of 51540694 is 49604515.

51540694 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49604515 = 5 ⋅9920903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51540691) by changing a digit.

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, 12885172 + ... + 12885175.

It is an arithmetic number, because the mean of its divisors is an integer number (19327761).

Almost surely, 2^51540694 is an apocalyptic number.

51540694 is a deficient number, since it is larger than the sum of its proper divisors (25770350).

51540694 is a wasteful number, since it uses less digits than its factorization.

51540694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25770349.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 51540694 is about 7179.1847726605. The cubic root of 51540694 is about 372.1489123250.

It can be divided in two parts, 515 and 40694, that added together give a square (41209 = 203²).

The spelling of 51540694 in words is "fifty-one million, five hundred forty thousand, six hundred ninety-four".