201028501 has 2 divisors, whose sum is σ = 201028502. Its totient is φ = 201028500.

The previous prime is 201028433. The next prime is 201028543. The reversal of 201028501 is 105820102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135839025 + 65189476 = 11655^2 + 8074^2 .

It is a cyclic number.

It is not a de Polignac number, because 201028501 - 2⁹ = 201027989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201028561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100514250 + 100514251.

It is an arithmetic number, because the mean of its divisors is an integer number (100514251).

Almost surely, 2^201028501 is an apocalyptic number.

It is an amenable number.

201028501 is a deficient number, since it is larger than the sum of its proper divisors (1).

201028501 is an equidigital number, since it uses as much as digits as its factorization.

201028501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 201028501 is about 14178.4519958986. The cubic root of 201028501 is about 585.8042858867.

Adding to 201028501 its reverse (105820102), we get a palindrome (306848603).

The spelling of 201028501 in words is "two hundred one million, twenty-eight thousand, five hundred one".