51121206 has 40 divisors (see below), whose sum is σ = 115059384. Its totient is φ = 16964640.

The previous prime is 51121163. The next prime is 51121237. The reversal of 51121206 is 60212115.

It is a super-2 number, since 2×51121206² = 5226755405788872, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 44961 + ... + 46083.

Almost surely, 2^51121206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51121206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57529692).

51121206 is an abundant number, since it is smaller than the sum of its proper divisors (63938178).

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

51121206 is a wasteful number, since it uses less digits than its factorization.

51121206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418 (or 1409 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 51121206 is about 7149.9095099169. The cubic root of 51121206 is about 371.1365248538.

Subtracting 51121206 from its reverse (60212115), we obtain a palindrome (9090909).

It can be divided in two parts, 5 and 1121206, that added together give a palindrome (1121211).

The spelling of 51121206 in words is "fifty-one million, one hundred twenty-one thousand, two hundred six".