51505142 has 32 divisors (see below), whose sum is σ = 88881408. Its totient is φ = 22198176.

The previous prime is 51505127. The next prime is 51505159. The reversal of 51505142 is 24150515.

It is a happy number.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24713 + ... + 26715.

It is an arithmetic number, because the mean of its divisors is an integer number (2777544).

Almost surely, 2^51505142 is an apocalyptic number.

51505142 is a deficient number, since it is larger than the sum of its proper divisors (37376266).

51505142 is a wasteful number, since it uses less digits than its factorization.

51505142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 51505142 is about 7176.7082983775. The cubic root of 51505142 is about 372.0633250581.

Adding to 51505142 its reverse (24150515), we get a palindrome (75655657).

The spelling of 51505142 in words is "fifty-one million, five hundred five thousand, one hundred forty-two".