2001561501 has 8 divisors (see below), whose sum is σ = 2674514560. Its totient is φ = 1331491392.

The previous prime is 2001561491. The next prime is 2001561503. The reversal of 2001561501 is 1051651002.

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

It is not a de Polignac number, because 2001561501 - 2¹¹ = 2001559453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001561503) 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, 719116 + ... + 721893.

It is an arithmetic number, because the mean of its divisors is an integer number (334314320).

Almost surely, 2^2001561501 is an apocalyptic number.

It is an amenable number.

2001561501 is a deficient number, since it is larger than the sum of its proper divisors (672953059).

2001561501 is a wasteful number, since it uses less digits than its factorization.

2001561501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441475.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 2001561501 is about 44738.8142556327. The cubic root of 2001561501 is about 1260.2488592604.

The spelling of 2001561501 in words is "two billion, one million, five hundred sixty-one thousand, five hundred one".