126210251 has 2 divisors, whose sum is σ = 126210252. Its totient is φ = 126210250.

The previous prime is 126210241. The next prime is 126210299. The reversal of 126210251 is 152012621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126210251 - 2¹⁴ = 126193867 is a prime.

It is not a weakly prime, because it can be changed into another prime (126210221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63105125 + 63105126.

It is an arithmetic number, because the mean of its divisors is an integer number (63105126).

Almost surely, 2^126210251 is an apocalyptic number.

126210251 is a deficient number, since it is larger than the sum of its proper divisors (1).

126210251 is an equidigital number, since it uses as much as digits as its factorization.

126210251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 126210251 is about 11234.3335805912. Note that the first 3 decimals coincide. The cubic root of 126210251 is about 501.6084879841.

Adding to 126210251 its reverse (152012621), we get a palindrome (278222872).

The spelling of 126210251 in words is "one hundred twenty-six million, two hundred ten thousand, two hundred fifty-one".