1660541231 has 4 divisors (see below), whose sum is σ = 1660806264. Its totient is φ = 1660276200.

The previous prime is 1660541221. The next prime is 1660541237. The reversal of 1660541231 is 1321450661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1321450661 = 367 ⋅3600683.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660541231 is a prime.

It is a super-2 number, since 2×1660541231² = 5514794359701990722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1660541194 and 1660541203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660541237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122885 + ... + 135726.

It is an arithmetic number, because the mean of its divisors is an integer number (415201566).

Almost surely, 2^1660541231 is an apocalyptic number.

1660541231 is a deficient number, since it is larger than the sum of its proper divisors (265033).

1660541231 is an equidigital number, since it uses as much as digits as its factorization.

1660541231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265032.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1660541231 is about 40749.7390298392. The cubic root of 1660541231 is about 1184.1768170064.

Adding to 1660541231 its reverse (1321450661), we get a palindrome (2981991892).

The spelling of 1660541231 in words is "one billion, six hundred sixty million, five hundred forty-one thousand, two hundred thirty-one".