1665412031 has 4 divisors (see below), whose sum is σ = 1665545952. Its totient is φ = 1665278112.

The previous prime is 1665412027. The next prime is 1665412043. The reversal of 1665412031 is 1302145661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1665412031 - 2² = 1665412027 is a prime.

It is a super-2 number, since 2×1665412031² = 5547194465999089922, 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 = 1665411985 and 1665412003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665412051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46151 + ... + 73896.

It is an arithmetic number, because the mean of its divisors is an integer number (416386488).

Almost surely, 2^1665412031 is an apocalyptic number.

1665412031 is a deficient number, since it is larger than the sum of its proper divisors (133921).

1665412031 is a wasteful number, since it uses less digits than its factorization.

1665412031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133920.

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

The square root of 1665412031 is about 40809.4600674893. The cubic root of 1665412031 is about 1185.3335197994. Note that the first 3 decimals are identical.

Adding to 1665412031 its reverse (1302145661), we get a palindrome (2967557692).

The spelling of 1665412031 in words is "one billion, six hundred sixty-five million, four hundred twelve thousand, thirty-one".