51785151 has 16 divisors (see below), whose sum is σ = 75496320. Its totient is φ = 31313120.

The previous prime is 51785131. The next prime is 51785183. The reversal of 51785151 is 15158715.

It is a cyclic number.

It is not a de Polignac number, because 51785151 - 2⁶ = 51785087 is a prime.

It is a super-3 number, since 3×51785151³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (33) 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 (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51785101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15256 + ... + 18338.

It is an arithmetic number, because the mean of its divisors is an integer number (4718520).

Almost surely, 2^51785151 is an apocalyptic number.

51785151 is a deficient number, since it is larger than the sum of its proper divisors (23711169).

51785151 is a wasteful number, since it uses less digits than its factorization.

51785151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3606.

The product of its digits is 7000, while the sum is 33.

The square root of 51785151 is about 7196.1900336220. The cubic root of 51785151 is about 372.7363507623.

The spelling of 51785151 in words is "fifty-one million, seven hundred eighty-five thousand, one hundred fifty-one".