51148231 has 4 divisors (see below), whose sum is σ = 51163200. Its totient is φ = 51133264.

The previous prime is 51148213. The next prime is 51148243. The reversal of 51148231 is 13284115.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51148231 - 2¹⁷ = 51017159 is a prime.

It is a super-2 number, since 2×51148231² = 5232283068858722, 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 = 51148196 and 51148205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51148261) 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, 435 + ... + 10123.

It is an arithmetic number, because the mean of its divisors is an integer number (12790800).

Almost surely, 2^51148231 is an apocalyptic number.

51148231 is a deficient number, since it is larger than the sum of its proper divisors (14969).

51148231 is an equidigital number, since it uses as much as digits as its factorization.

51148231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14968.

The product of its digits is 960, while the sum is 25.

The square root of 51148231 is about 7151.7991442713. The cubic root of 51148231 is about 371.2019132282.

The spelling of 51148231 in words is "fifty-one million, one hundred forty-eight thousand, two hundred thirty-one".