201530251 has 16 divisors (see below), whose sum is σ = 225237600. Its totient is φ = 179036928.

The previous prime is 201530239. The next prime is 201530261. The reversal of 201530251 is 152035102.

It is a cyclic number.

It is not a de Polignac number, because 201530251 - 2²³ = 193141643 is a prime.

It is a super-2 number, since 2×201530251² = 81228884136246002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201530261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153540 + ... + 154846.

It is an arithmetic number, because the mean of its divisors is an integer number (14077350).

Almost surely, 2^201530251 is an apocalyptic number.

201530251 is a deficient number, since it is larger than the sum of its proper divisors (23707349).

201530251 is a wasteful number, since it uses less digits than its factorization.

201530251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 201530251 is about 14196.1350726175. The cubic root of 201530251 is about 586.2912534864.

Adding to 201530251 its reverse (152035102), we get a palindrome (353565353).

The spelling of 201530251 in words is "two hundred one million, five hundred thirty thousand, two hundred fifty-one".