201005251 has 4 divisors (see below), whose sum is σ = 202995504. Its totient is φ = 199015000.

The previous prime is 201005249. The next prime is 201005261. The reversal of 201005251 is 152500102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201005251 - 2¹ = 201005249 is a prime.

It is a super-2 number, since 2×201005251² = 80806221859146002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201005261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994975 + ... + 995176.

It is an arithmetic number, because the mean of its divisors is an integer number (50748876).

Almost surely, 2^201005251 is an apocalyptic number.

201005251 is a deficient number, since it is larger than the sum of its proper divisors (1990253).

201005251 is a wasteful number, since it uses less digits than its factorization.

201005251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990252.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 201005251 is about 14177.6320660398. The cubic root of 201005251 is about 585.7817012371.

Adding to 201005251 its reverse (152500102), we get a palindrome (353505353).

The spelling of 201005251 in words is "two hundred one million, five thousand, two hundred fifty-one".