51121230 has 16 divisors (see below), whose sum is σ = 122691024. Its totient is φ = 13632320.

The previous prime is 51121163. The next prime is 51121237. The reversal of 51121230 is 3212115.

It is a super-2 number, since 2×51121230² = 5226760313425800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121237) 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, 851991 + ... + 852050.

It is an arithmetic number, because the mean of its divisors is an integer number (7668189).

Almost surely, 2^51121230 is an apocalyptic number.

51121230 is an abundant number, since it is smaller than the sum of its proper divisors (71569794).

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

51121230 is a wasteful number, since it uses less digits than its factorization.

51121230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704051.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 51121230 is about 7149.9111882596. The cubic root of 51121230 is about 371.1365829333.

Adding to 51121230 its reverse (3212115), we get a palindrome (54333345).

The spelling of 51121230 in words is "fifty-one million, one hundred twenty-one thousand, two hundred thirty".