251284133 has 2 divisors, whose sum is σ = 251284134. Its totient is φ = 251284132.

The previous prime is 251284097. The next prime is 251284141. The reversal of 251284133 is 331482152.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161849284 + 89434849 = 12722^2 + 9457^2 .

It is a cyclic number.

It is not a de Polignac number, because 251284133 - 2¹⁴ = 251267749 is a prime.

It is a Chen prime.

It is equal to p_13745720 and since 251284133 and 13745720 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 251284096 and 251284105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251284933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125642066 + 125642067.

It is an arithmetic number, because the mean of its divisors is an integer number (125642067).

Almost surely, 2^251284133 is an apocalyptic number.

It is an amenable number.

251284133 is a deficient number, since it is larger than the sum of its proper divisors (1).

251284133 is an equidigital number, since it uses as much as digits as its factorization.

251284133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 251284133 is about 15851.9441394423. The cubic root of 251284133 is about 631.0372875696.

The spelling of 251284133 in words is "two hundred fifty-one million, two hundred eighty-four thousand, one hundred thirty-three".