201525551 has 4 divisors (see below), whose sum is σ = 203603232. Its totient is φ = 199447872.

The previous prime is 201525547. The next prime is 201525601. The reversal of 201525551 is 155525102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155525102 = 2 ⋅77762551.

It is a cyclic number.

It is not a de Polignac number, because 201525551 - 2² = 201525547 is a prime.

It is a super-2 number, since 2×201525551² = 81225095411707202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201525551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201525521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1038695 + ... + 1038888.

It is an arithmetic number, because the mean of its divisors is an integer number (50900808).

Almost surely, 2^201525551 is an apocalyptic number.

201525551 is a deficient number, since it is larger than the sum of its proper divisors (2077681).

201525551 is an equidigital number, since it uses as much as digits as its factorization.

201525551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077680.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 201525551 is about 14195.9695336388. The cubic root of 201525551 is about 586.2866957086.

The spelling of 201525551 in words is "two hundred one million, five hundred twenty-five thousand, five hundred fifty-one".