201521772 has 36 divisors (see below), whose sum is σ = 509989480. Its totient is φ = 67096512.

The previous prime is 201521743. The next prime is 201521797. The reversal of 201521772 is 277125102.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×201521772² = 81222049180039968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34479 + ... + 39897.

Almost surely, 2^201521772 is an apocalyptic number.

It is an amenable number.

201521772 is an abundant number, since it is smaller than the sum of its proper divisors (308467708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201521772 is a wasteful number, since it uses less digits than its factorization.

201521772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6462 (or 6457 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 201521772 is about 14195.8364318556. The cubic root of 201521772 is about 586.2830310099.

Adding to 201521772 its reverse (277125102), we get a palindrome (478646874).

The spelling of 201521772 in words is "two hundred one million, five hundred twenty-one thousand, seven hundred seventy-two".