1591401 has 8 divisors (see below), whose sum is σ = 2425024. Its totient is φ = 909360.

The previous prime is 1591397. The next prime is 1591417. The reversal of 1591401 is 1041951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1591401 - 2² = 1591397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 75781 = 1591401 / (1 + 5 + 9 + 1 + 4 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (1591441) 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, 37870 + ... + 37911.

It is an arithmetic number, because the mean of its divisors is an integer number (303128).

2^1591401 is an apocalyptic number.

It is an amenable number.

1591401 is a deficient number, since it is larger than the sum of its proper divisors (833623).

1591401 is an equidigital number, since it uses as much as digits as its factorization.

1591401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75791.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 1591401 is about 1261.5074316071. The cubic root of 1591401 is about 116.7508028013.

The spelling of 1591401 in words is "one million, five hundred ninety-one thousand, four hundred one".