51530121 has 8 divisors (see below), whose sum is σ = 76340960. Its totient is φ = 34353396.

The previous prime is 51530113. The next prime is 51530131. The reversal of 51530121 is 12103515.

51530121 is a `hidden beast` number, since 515 + 30 + 121 = 666.

It is not a de Polignac number, because 51530121 - 2³ = 51530113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51530094 and 51530103.

It is not an unprimeable number, because it can be changed into a prime (51530131) 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, 954235 + ... + 954288.

It is an arithmetic number, because the mean of its divisors is an integer number (9542620).

Almost surely, 2^51530121 is an apocalyptic number.

It is an amenable number.

51530121 is a deficient number, since it is larger than the sum of its proper divisors (24810839).

51530121 is a wasteful number, since it uses less digits than its factorization.

51530121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908532 (or 1908526 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 51530121 is about 7178.4483699474. The cubic root of 51530121 is about 372.1234631816.

Adding to 51530121 its reverse (12103515), we get a palindrome (63633636).

The spelling of 51530121 in words is "fifty-one million, five hundred thirty thousand, one hundred twenty-one".