1591541 has 4 divisors (see below), whose sum is σ = 1818912. Its totient is φ = 1364172.

The previous prime is 1591511. The next prime is 1591547. The reversal of 1591541 is 1451951.

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: 1451951 = 1009 ⋅1439.

It is a cyclic number.

It is not a de Polignac number, because 1591541 - 2¹⁸ = 1329397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1591541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591547) 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, 113675 + ... + 113688.

It is an arithmetic number, because the mean of its divisors is an integer number (454728).

2^1591541 is an apocalyptic number.

It is an amenable number.

1591541 is a deficient number, since it is larger than the sum of its proper divisors (227371).

1591541 is an equidigital number, since it uses as much as digits as its factorization.

1591541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227370.

The product of its digits is 900, while the sum is 26.

The square root of 1591541 is about 1261.5629195565. The cubic root of 1591541 is about 116.7542263325.

The spelling of 1591541 in words is "one million, five hundred ninety-one thousand, five hundred forty-one".