201545521 has 8 divisors (see below), whose sum is σ = 214138080. Its totient is φ = 189151488.

The previous prime is 201545503. The next prime is 201545543. The reversal of 201545521 is 125545102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201545521 - 2⁹ = 201545009 is a prime.

It is a super-2 number, since 2×201545521² = 81241194070322882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201545551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47536 + ... + 51601.

It is an arithmetic number, because the mean of its divisors is an integer number (26767260).

Almost surely, 2^201545521 is an apocalyptic number.

It is an amenable number.

201545521 is a deficient number, since it is larger than the sum of its proper divisors (12592559).

201545521 is a wasteful number, since it uses less digits than its factorization.

201545521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99263.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 201545521 is about 14196.6728848699. The cubic root of 201545521 is about 586.3060609264.

The spelling of 201545521 in words is "two hundred one million, five hundred forty-five thousand, five hundred twenty-one".