51220442 has 16 divisors (see below), whose sum is σ = 94561152. Its totient is φ = 20262960.

The previous prime is 51220427. The next prime is 51220457. The reversal of 51220442 is 24402215.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51220427) and next prime (51220457).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140534 + ... + 140897.

It is an arithmetic number, because the mean of its divisors is an integer number (5910072).

Almost surely, 2^51220442 is an apocalyptic number.

51220442 is a deficient number, since it is larger than the sum of its proper divisors (43340710).

51220442 is a wasteful number, since it uses less digits than its factorization.

51220442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281453.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 51220442 is about 7156.8458136249. The cubic root of 51220442 is about 371.3765185297.

Adding to 51220442 its reverse (24402215), we get a palindrome (75622657).

The spelling of 51220442 in words is "fifty-one million, two hundred twenty thousand, four hundred forty-two".