251650001 has 2 divisors, whose sum is σ = 251650002. Its totient is φ = 251650000.

The previous prime is 251649977. The next prime is 251650037. The reversal of 251650001 is 100056152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249166225 + 2483776 = 15785^2 + 1576^2 .

It is a cyclic number.

It is not a de Polignac number, because 251650001 - 2²² = 247455697 is a prime.

It is not a weakly prime, because it can be changed into another prime (251650051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125825000 + 125825001.

It is an arithmetic number, because the mean of its divisors is an integer number (125825001).

Almost surely, 2^251650001 is an apocalyptic number.

It is an amenable number.

251650001 is a deficient number, since it is larger than the sum of its proper divisors (1).

251650001 is an equidigital number, since it uses as much as digits as its factorization.

251650001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 251650001 is about 15863.4801036847. The cubic root of 251650001 is about 631.3434010604.

The spelling of 251650001 in words is "two hundred fifty-one million, six hundred fifty thousand, one".