51121072 has 20 divisors (see below), whose sum is σ = 99221080. Its totient is φ = 25515648.

The previous prime is 51121061. The next prime is 51121073. The reversal of 51121072 is 27012115.

It is a super-2 number, since 2×51121072² = 5226728004858368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51121073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7804 + ... + 12772.

It is an arithmetic number, because the mean of its divisors is an integer number (4961054).

Almost surely, 2^51121072 is an apocalyptic number.

It is an amenable number.

51121072 is a deficient number, since it is larger than the sum of its proper divisors (48100008).

51121072 is a wasteful number, since it uses less digits than its factorization.

51121072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5620 (or 5614 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 51121072 is about 7149.9001391628. The cubic root of 51121072 is about 371.1362005765.

Adding to 51121072 its reverse (27012115), we get a palindrome (78133187).

The spelling of 51121072 in words is "fifty-one million, one hundred twenty-one thousand, seventy-two".