51121572 has 12 divisors (see below), whose sum is σ = 119283696. Its totient is φ = 17040520.

The previous prime is 51121561. The next prime is 51121579. The reversal of 51121572 is 27512115.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×51121572² = 5226830247502368, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (51121579) 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, 2130054 + ... + 2130077.

It is an arithmetic number, because the mean of its divisors is an integer number (9940308).

Almost surely, 2^51121572 is an apocalyptic number.

It is an amenable number.

51121572 is an abundant number, since it is smaller than the sum of its proper divisors (68162124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51121572 is a wasteful number, since it uses less digits than its factorization.

51121572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260138 (or 4260136 counting only the distinct ones).

The product of its digits is 700, while the sum is 24.

The square root of 51121572 is about 7149.9351046006. The cubic root of 51121572 is about 371.1374105635.

Adding to 51121572 its reverse (27512115), we get a palindrome (78633687).

The spelling of 51121572 in words is "fifty-one million, one hundred twenty-one thousand, five hundred seventy-two".