201121545 has 16 divisors (see below), whose sum is σ = 335786112. Its totient is φ = 102600960.

The previous prime is 201121519. The next prime is 201121561. The reversal of 201121545 is 545121102.

It is not a de Polignac number, because 201121545 - 2⁵ = 201121513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291136 + ... + 291825.

It is an arithmetic number, because the mean of its divisors is an integer number (20986632).

Almost surely, 2^201121545 is an apocalyptic number.

It is an amenable number.

201121545 is a deficient number, since it is larger than the sum of its proper divisors (134664567).

201121545 is a wasteful number, since it uses less digits than its factorization.

201121545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582992.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 201121545 is about 14181.7327925751. The cubic root of 201121545 is about 585.8946498015.

Adding to 201121545 its reverse (545121102), we get a palindrome (746242647).

The spelling of 201121545 in words is "two hundred one million, one hundred twenty-one thousand, five hundred forty-five".