51218202 has 16 divisors (see below), whose sum is σ = 117070272. Its totient is φ = 14633760.

The previous prime is 51218201. The next prime is 51218213. The reversal of 51218202 is 20281215.

It is a happy number.

It is a super-2 number, since 2×51218202² = 5246608432225608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (51218201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 609699 + ... + 609782.

It is an arithmetic number, because the mean of its divisors is an integer number (7316892).

Almost surely, 2^51218202 is an apocalyptic number.

51218202 is an abundant number, since it is smaller than the sum of its proper divisors (65852070).

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

51218202 is a wasteful number, since it uses less digits than its factorization.

51218202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219493.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 51218202 is about 7156.6893183930. The cubic root of 51218202 is about 371.3711047047.

Adding to 51218202 its reverse (20281215), we get a palindrome (71499417).

The spelling of 51218202 in words is "fifty-one million, two hundred eighteen thousand, two hundred two".