51307694 has 4 divisors (see below), whose sum is σ = 76961544. Its totient is φ = 25653846.

The previous prime is 51307693. The next prime is 51307721. The reversal of 51307694 is 49670315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49670315 = 5 ⋅9934063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51307693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12826922 + ... + 12826925.

It is an arithmetic number, because the mean of its divisors is an integer number (19240386).

Almost surely, 2^51307694 is an apocalyptic number.

51307694 is a deficient number, since it is larger than the sum of its proper divisors (25653850).

51307694 is a wasteful number, since it uses less digits than its factorization.

51307694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25653849.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 51307694 is about 7162.9389219789. The cubic root of 51307694 is about 371.5872739810.

The spelling of 51307694 in words is "fifty-one million, three hundred seven thousand, six hundred ninety-four".