51153231 has 4 divisors (see below), whose sum is σ = 68204312. Its totient is φ = 34102152.

The previous prime is 51153163. The next prime is 51153239. The reversal of 51153231 is 13235115.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51153231 - 2⁷ = 51153103 is a prime.

It is a super-2 number, since 2×51153231² = 5233306083478722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51153198 and 51153207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51153239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8525536 + ... + 8525541.

It is an arithmetic number, because the mean of its divisors is an integer number (17051078).

Almost surely, 2^51153231 is an apocalyptic number.

51153231 is a deficient number, since it is larger than the sum of its proper divisors (17051081).

51153231 is a wasteful number, since it uses less digits than its factorization.

51153231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17051080.

The product of its digits is 450, while the sum is 21.

The square root of 51153231 is about 7152.1486981186. The cubic root of 51153231 is about 371.2140084597.

Adding to 51153231 its reverse (13235115), we get a palindrome (64388346).

The spelling of 51153231 in words is "fifty-one million, one hundred fifty-three thousand, two hundred thirty-one".