1601657 has 4 divisors (see below), whose sum is σ = 1612416. Its totient is φ = 1590900.

The previous prime is 1601653. The next prime is 1601659. The reversal of 1601657 is 7561061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7561061 = 37 ⋅204353.

It is a cyclic number.

It is not a de Polignac number, because 1601657 - 2² = 1601653 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 5153 + ... + 5454.

It is an arithmetic number, because the mean of its divisors is an integer number (403104).

2^1601657 is an apocalyptic number.

It is an amenable number.

1601657 is a deficient number, since it is larger than the sum of its proper divisors (10759).

1601657 is a wasteful number, since it uses less digits than its factorization.

1601657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10758.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 1601657 is about 1265.5658813353. The cubic root of 1601657 is about 117.0010714101.

The spelling of 1601657 in words is "one million, six hundred one thousand, six hundred fifty-seven".