51224389 has 2 divisors, whose sum is σ = 51224390. Its totient is φ = 51224388.

The previous prime is 51224359. The next prime is 51224429. The reversal of 51224389 is 98342215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51008164 + 216225 = 7142^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 51224389 - 2¹³ = 51216197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51224359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25612194 + 25612195.

It is an arithmetic number, because the mean of its divisors is an integer number (25612195).

Almost surely, 2^51224389 is an apocalyptic number.

It is an amenable number.

51224389 is a deficient number, since it is larger than the sum of its proper divisors (1).

51224389 is an equidigital number, since it uses as much as digits as its factorization.

51224389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 51224389 is about 7157.1215582803. The cubic root of 51224389 is about 371.3860575953.

It can be divided in two parts, 512 and 24389, that multiplied together give a cube (12487168 = 232³).

The spelling of 51224389 in words is "fifty-one million, two hundred twenty-four thousand, three hundred eighty-nine".