51125121 has 16 divisors (see below), whose sum is σ = 76141120. Its totient is φ = 33903360.

The previous prime is 51125119. The next prime is 51125131. The reversal of 51125121 is 12152115.

It is not a de Polignac number, because 51125121 - 2¹ = 51125119 is a prime.

It is a super-2 number, since 2×51125121² = 5227555994529282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51125094 and 51125103.

It is not an unprimeable number, because it can be changed into a prime (51125131) 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, 306 + ... + 10116.

It is an arithmetic number, because the mean of its divisors is an integer number (4758820).

Almost surely, 2^51125121 is an apocalyptic number.

It is an amenable number.

51125121 is a deficient number, since it is larger than the sum of its proper divisors (25015999).

51125121 is a wasteful number, since it uses less digits than its factorization.

51125121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10013 (or 10007 counting only the distinct ones).

The product of its digits is 100, while the sum is 18.

The square root of 51125121 is about 7150.1832843641. The cubic root of 51125121 is about 371.1459988244.

Adding to 51125121 its reverse (12152115), we get a palindrome (63277236).

The spelling of 51125121 in words is "fifty-one million, one hundred twenty-five thousand, one hundred twenty-one".