51693542 has 4 divisors (see below), whose sum is σ = 77540316. Its totient is φ = 25846770.

The previous prime is 51693541. The next prime is 51693553. The reversal of 51693542 is 24539615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24539615 = 5 ⋅4907923.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51693541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12923384 + ... + 12923387.

It is an arithmetic number, because the mean of its divisors is an integer number (19385079).

Almost surely, 2^51693542 is an apocalyptic number.

51693542 is a deficient number, since it is larger than the sum of its proper divisors (25846774).

51693542 is a wasteful number, since it uses less digits than its factorization.

51693542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25846773.

The product of its digits is 32400, while the sum is 35.

The square root of 51693542 is about 7189.8221118467. The cubic root of 51693542 is about 372.5164282651.

The spelling of 51693542 in words is "fifty-one million, six hundred ninety-three thousand, five hundred forty-two".