51242022 has 48 divisors (see below), whose sum is σ = 124776288. Its totient is φ = 15079680.

The previous prime is 51241991. The next prime is 51242027. The reversal of 51242022 is 22024215.

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

It is a junction number, because it is equal to n+sod(n) for n = 51241986 and 51242004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51242027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 622 + ... + 10142.

It is an arithmetic number, because the mean of its divisors is an integer number (2599506).

Almost surely, 2^51242022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51242022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62388144).

51242022 is an abundant number, since it is smaller than the sum of its proper divisors (73534266).

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

51242022 is a wasteful number, since it uses less digits than its factorization.

51242022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9565 (or 9562 counting only the distinct ones).

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

The square root of 51242022 is about 7158.3533022616. The cubic root of 51242022 is about 371.4286668498.

Adding to 51242022 its reverse (22024215), we get a palindrome (73266237).

The spelling of 51242022 in words is "fifty-one million, two hundred forty-two thousand, twenty-two".