51017742 has 16 divisors (see below), whose sum is σ = 113372880. Its totient is φ = 17005896.

The previous prime is 51017741. The next prime is 51017773. The reversal of 51017742 is 24771015.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51017741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472333 + ... + 472440.

It is an arithmetic number, because the mean of its divisors is an integer number (7085805).

Almost surely, 2^51017742 is an apocalyptic number.

51017742 is an abundant number, since it is smaller than the sum of its proper divisors (62355138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51017742 is a wasteful number, since it uses less digits than its factorization.

51017742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944784 (or 944778 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 51017742 is about 7142.6705089903. The cubic root of 51017742 is about 370.8859751834.

Adding to 51017742 its reverse (24771015), we get a palindrome (75788757).

The spelling of 51017742 in words is "fifty-one million, seventeen thousand, seven hundred forty-two".