1561501 has 8 divisors (see below), whose sum is σ = 1707264. Its totient is φ = 1421760.

The previous prime is 1561499. The next prime is 1561519. The reversal of 1561501 is 1051651.

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

It is a cyclic number.

It is not a de Polignac number, because 1561501 - 2¹ = 1561499 is a prime.

It is a Duffinian number.

1561501 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561541) 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, 955 + ... + 2008.

It is an arithmetic number, because the mean of its divisors is an integer number (213408).

2^1561501 is an apocalyptic number.

It is an amenable number.

1561501 is a deficient number, since it is larger than the sum of its proper divisors (145763).

1561501 is a wasteful number, since it uses less digits than its factorization.

1561501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1561501 is about 1249.6003361075. The cubic root of 1561501 is about 116.0149851826.

Adding to 1561501 its product of nonzero digits (150), we get a palindrome (1561651).

It can be divided in two parts, 15 and 61501, that added together give a palindrome (61516).

The spelling of 1561501 in words is "one million, five hundred sixty-one thousand, five hundred one".