1601651 has 8 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 1511752.

The previous prime is 1601647. The next prime is 1601653. The reversal of 1601651 is 1561061.

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 1601651 - 2² = 1601647 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1601653) 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, 1490 + ... + 2328.

It is an arithmetic number, because the mean of its divisors is an integer number (211680).

2^1601651 is an apocalyptic number.

1601651 is a deficient number, since it is larger than the sum of its proper divisors (91789).

1601651 is an equidigital number, since it uses as much as digits as its factorization.

1601651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945.

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

The square root of 1601651 is about 1265.5635108520. The cubic root of 1601651 is about 117.0009253098. Note that the first 3 decimals are identical.

The spelling of 1601651 in words is "one million, six hundred one thousand, six hundred fifty-one".