51151238 has 4 divisors (see below), whose sum is σ = 76726860. Its totient is φ = 25575618.

The previous prime is 51151229. The next prime is 51151297. The reversal of 51151238 is 83215115.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83215115 = 5 ⋅16643023.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12787808 + ... + 12787811.

It is an arithmetic number, because the mean of its divisors is an integer number (19181715).

Almost surely, 2^51151238 is an apocalyptic number.

51151238 is a deficient number, since it is larger than the sum of its proper divisors (25575622).

51151238 is a wasteful number, since it uses less digits than its factorization.

51151238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25575621.

The product of its digits is 1200, while the sum is 26.

The square root of 51151238 is about 7152.0093680028. The cubic root of 51151238 is about 371.2091873949.

The spelling of 51151238 in words is "fifty-one million, one hundred fifty-one thousand, two hundred thirty-eight".