51222042 has 24 divisors (see below), whose sum is σ = 111136116. Its totient is φ = 17050176.

The previous prime is 51222001. The next prime is 51222047. The reversal of 51222042 is 24022215.

It can be written as a sum of positive squares in 2 ways, for example, as 50851161 + 370881 = 7131^2 + 609^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51222047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15348 + ... + 18384.

Almost surely, 2^51222042 is an apocalyptic number.

51222042 is an abundant number, since it is smaller than the sum of its proper divisors (59914074).

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

51222042 is a wasteful number, since it uses less digits than its factorization.

51222042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3982 (or 3979 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 51222042 is about 7156.9575938383. The cubic root of 51222042 is about 371.3803854509.

Adding to 51222042 its reverse (24022215), we get a palindrome (75244257).

The spelling of 51222042 in words is "fifty-one million, two hundred twenty-two thousand, forty-two".