251428601 has 2 divisors, whose sum is σ = 251428602. Its totient is φ = 251428600.

The previous prime is 251428553. The next prime is 251428603. The reversal of 251428601 is 106824152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232593001 + 18835600 = 15251^2 + 4340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251428601 is a prime.

It is a Sophie Germain prime.

Together with 251428603, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (251428603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125714300 + 125714301.

It is an arithmetic number, because the mean of its divisors is an integer number (125714301).

Almost surely, 2^251428601 is an apocalyptic number.

It is an amenable number.

251428601 is a deficient number, since it is larger than the sum of its proper divisors (1).

251428601 is an equidigital number, since it uses as much as digits as its factorization.

251428601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 251428601 is about 15856.5002759121. The cubic root of 251428601 is about 631.1581961583.

The spelling of 251428601 in words is "two hundred fifty-one million, four hundred twenty-eight thousand, six hundred one".