1597641 has 4 divisors (see below), whose sum is σ = 2130192. Its totient is φ = 1065092.

The previous prime is 1597621. The next prime is 1597657. The reversal of 1597641 is 1467951.

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.

It is a cyclic number.

It is not a de Polignac number, because 1597641 - 2⁷ = 1597513 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1597601) 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, 266271 + ... + 266276.

It is an arithmetic number, because the mean of its divisors is an integer number (532548).

2^1597641 is an apocalyptic number.

It is an amenable number.

1597641 is a deficient number, since it is larger than the sum of its proper divisors (532551).

1597641 is an equidigital number, since it uses as much as digits as its factorization.

1597641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532550.

The product of its digits is 7560, while the sum is 33.

The square root of 1597641 is about 1263.9782434836. The cubic root of 1597641 is about 116.9031999403.

The spelling of 1597641 in words is "one million, five hundred ninety-seven thousand, six hundred forty-one".