51231225 has 12 divisors (see below), whose sum is σ = 84702416. Its totient is φ = 27323280.

The previous prime is 51231223. The next prime is 51231227. The reversal of 51231225 is 52213215.

It is an interprime number because it is at equal distance from previous prime (51231223) and next prime (51231227).

It is not a de Polignac number, because 51231225 - 2¹ = 51231223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51231223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 341467 + ... + 341616.

Almost surely, 2^51231225 is an apocalyptic number.

It is an amenable number.

51231225 is a deficient number, since it is larger than the sum of its proper divisors (33471191).

51231225 is a wasteful number, since it uses less digits than its factorization.

51231225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683096 (or 683091 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 51231225 is about 7157.5991086397. The cubic root of 51231225 is about 371.4025776047.

The spelling of 51231225 in words is "fifty-one million, two hundred thirty-one thousand, two hundred twenty-five".