201155501 has 2 divisors, whose sum is σ = 201155502. Its totient is φ = 201155500.

The previous prime is 201155473. The next prime is 201155503. The reversal of 201155501 is 105551102.

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., 197430601 + 3724900 = 14051^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 201155501 - 2¹⁰ = 201154477 is a prime.

It is a super-2 number, since 2×201155501² = 80927071165122002, which contains 22 as substring.

Together with 201155503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201155503) 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, 100577750 + 100577751.

It is an arithmetic number, because the mean of its divisors is an integer number (100577751).

Almost surely, 2^201155501 is an apocalyptic number.

It is an amenable number.

201155501 is a deficient number, since it is larger than the sum of its proper divisors (1).

201155501 is an equidigital number, since it uses as much as digits as its factorization.

201155501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 201155501 is about 14182.9299159236. The cubic root of 201155501 is about 585.9276207747.

The spelling of 201155501 in words is "two hundred one million, one hundred fifty-five thousand, five hundred one".