2001154564 has 6 divisors (see below), whose sum is σ = 3502020494. Its totient is φ = 1000577280.

The previous prime is 2001154543. The next prime is 2001154607. The reversal of 2001154564 is 4654511002.

It can be written as a sum of positive squares in only one way, i.e., 1015696900 + 985457664 = 31870^2 + 31392^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250144317 + ... + 250144324.

Almost surely, 2^2001154564 is an apocalyptic number.

It is an amenable number.

2001154564 is a deficient number, since it is larger than the sum of its proper divisors (1500865930).

2001154564 is a wasteful number, since it uses less digits than its factorization.

2001154564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500288645 (or 500288643 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 2001154564 is about 44734.2661055259. The cubic root of 2001154564 is about 1260.1634465050.

Adding to 2001154564 its reverse (4654511002), we get a palindrome (6655665566).

The spelling of 2001154564 in words is "two billion, one million, one hundred fifty-four thousand, five hundred sixty-four".