1331601 has 4 divisors (see below), whose sum is σ = 1775472. Its totient is φ = 887732.

The previous prime is 1331599. The next prime is 1331611. The reversal of 1331601 is 1061331.

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: 1061331 = 3 ⋅353777.

It is a cyclic number.

It is not a de Polignac number, because 1331601 - 2¹ = 1331599 is a prime.

It is a super-2 number, since 2×1331601² = 3546322446402, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1331611) 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, 221931 + ... + 221936.

It is an arithmetic number, because the mean of its divisors is an integer number (443868).

2^1331601 is an apocalyptic number.

It is an amenable number.

1331601 is a deficient number, since it is larger than the sum of its proper divisors (443871).

1331601 is an equidigital number, since it uses as much as digits as its factorization.

1331601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443870.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 1331601 is about 1153.9501722345. The cubic root of 1331601 is about 110.0165539825.

Adding to 1331601 its reverse (1061331), we get a palindrome (2392932).

The spelling of 1331601 in words is "one million, three hundred thirty-one thousand, six hundred one".