1501661 has 8 divisors (see below), whose sum is σ = 1817280. Its totient is φ = 1211328.

The previous prime is 1501639. The next prime is 1501663. The reversal of 1501661 is 1661051.

It is a happy number.

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 1501661 - 2⁶ = 1501597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1501663) 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, 6191 + ... + 6428.

It is an arithmetic number, because the mean of its divisors is an integer number (227160).

2^1501661 is an apocalyptic number.

It is an amenable number.

1501661 is a deficient number, since it is larger than the sum of its proper divisors (315619).

1501661 is a wasteful number, since it uses less digits than its factorization.

1501661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12643.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1501661 is about 1225.4227841851. The cubic root of 1501661 is about 114.5136613436.

The spelling of 1501661 in words is "one million, five hundred one thousand, six hundred sixty-one".