51081742 has 8 divisors (see below), whose sum is σ = 76712616. Its totient is φ = 25510872.

The previous prime is 51081739. The next prime is 51081743. The reversal of 51081742 is 24718015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 51081742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51081743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12808 + ... + 16315.

It is an arithmetic number, because the mean of its divisors is an integer number (9589077).

Almost surely, 2^51081742 is an apocalyptic number.

51081742 is a deficient number, since it is larger than the sum of its proper divisors (25630874).

51081742 is a wasteful number, since it uses less digits than its factorization.

51081742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30002.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 51081742 is about 7147.1492218926. The cubic root of 51081742 is about 371.0409982712.

Adding to 51081742 its reverse (24718015), we get a palindrome (75799757).

The spelling of 51081742 in words is "fifty-one million, eighty-one thousand, seven hundred forty-two".