51155201 has 8 divisors (see below), whose sum is σ = 55303680. Its totient is φ = 47152368.

The previous prime is 51155189. The next prime is 51155257. The reversal of 51155201 is 10255115.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51155201 - 2²² = 46960897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51155281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35681 + ... + 37086.

It is an arithmetic number, because the mean of its divisors is an integer number (6912960).

Almost surely, 2^51155201 is an apocalyptic number.

It is an amenable number.

51155201 is a deficient number, since it is larger than the sum of its proper divisors (4148479).

51155201 is a wasteful number, since it uses less digits than its factorization.

51155201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72823.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 51155201 is about 7152.2864176430. The cubic root of 51155201 is about 371.2187737645.

The spelling of 51155201 in words is "fifty-one million, one hundred fifty-five thousand, two hundred one".