201561572 has 6 divisors (see below), whose sum is σ = 352732758. Its totient is φ = 100780784.

The previous prime is 201561539. The next prime is 201561583. The reversal of 201561572 is 275165102.

It can be written as a sum of positive squares in only one way, i.e., 191988736 + 9572836 = 13856^2 + 3094^2 .

It is a super-2 number, since 2×201561572² = 81254134614222368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25195193 + ... + 25195200.

It is an arithmetic number, because the mean of its divisors is an integer number (58788793).

Almost surely, 2^201561572 is an apocalyptic number.

It is an amenable number.

201561572 is a deficient number, since it is larger than the sum of its proper divisors (151171186).

201561572 is a wasteful number, since it uses less digits than its factorization.

201561572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50390397 (or 50390395 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 201561572 is about 14197.2381821254. The cubic root of 201561572 is about 586.3216249021.

The spelling of 201561572 in words is "two hundred one million, five hundred sixty-one thousand, five hundred seventy-two".