1651601 has 8 divisors (see below), whose sum is σ = 1998720. Its totient is φ = 1332288.

The previous prime is 1651597. The next prime is 1651609. The reversal of 1651601 is 1061561.

It is a happy number.

1651601 is nontrivially palindromic in base 16.

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 1651601 - 2² = 1651597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1651609) 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, 6821 + ... + 7058.

It is an arithmetic number, because the mean of its divisors is an integer number (249840).

2^1651601 is an apocalyptic number.

It is an amenable number.

1651601 is a deficient number, since it is larger than the sum of its proper divisors (347119).

1651601 is a wasteful number, since it uses less digits than its factorization.

1651601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13903.

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

The square root of 1651601 is about 1285.1462951742. The cubic root of 1651601 is about 118.2047818206.

The spelling of 1651601 in words is "one million, six hundred fifty-one thousand, six hundred one".