51251022 has 32 divisors (see below), whose sum is σ = 120592800. Its totient is φ = 16078464.

The previous prime is 51250987. The next prime is 51251023. The reversal of 51251022 is 22015215.

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 = 51250986 and 51251004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51251023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26997 + ... + 28832.

It is an arithmetic number, because the mean of its divisors is an integer number (3768525).

Almost surely, 2^51251022 is an apocalyptic number.

51251022 is an abundant number, since it is smaller than the sum of its proper divisors (69341778).

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

51251022 is a wasteful number, since it uses less digits than its factorization.

51251022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55857 (or 55851 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51251022 is about 7158.9819108586. The cubic root of 51251022 is about 371.4504111278.

Adding to 51251022 its reverse (22015215), we get a palindrome (73266237).

The spelling of 51251022 in words is "fifty-one million, two hundred fifty-one thousand, twenty-two".