51117201 has 48 divisors (see below), whose sum is σ = 83341440. Its totient is φ = 30032640.

The previous prime is 51117191. The next prime is 51117203. The reversal of 51117201 is 10271115.

It is a happy number.

It is not a de Polignac number, because 51117201 - 2¹¹ = 51115153 is a prime.

It is a super-2 number, since 2×51117201² = 5225936476148802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51117203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161095 + ... + 161411.

It is an arithmetic number, because the mean of its divisors is an integer number (1736280).

Almost surely, 2^51117201 is an apocalyptic number.

It is an amenable number.

51117201 is a deficient number, since it is larger than the sum of its proper divisors (32224239).

51117201 is a wasteful number, since it uses less digits than its factorization.

51117201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 18.

The square root of 51117201 is about 7149.6294309565. The cubic root of 51117201 is about 371.1268325903.

Adding to 51117201 its reverse (10271115), we get a palindrome (61388316).

The spelling of 51117201 in words is "fifty-one million, one hundred seventeen thousand, two hundred one".