440121002165531 has 2 divisors, whose sum is σ = 440121002165532. Its totient is φ = 440121002165530.

The previous prime is 440121002165513. The next prime is 440121002165627. The reversal of 440121002165531 is 135561200121044.

It is a happy number.

Together with previous prime (440121002165513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440121002165531 is a prime.

It is a super-2 number, since 2×440121002165531² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 440121002165491 and 440121002165500.

It is not a weakly prime, because it can be changed into another prime (440121002165431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220060501082765 + 220060501082766.

It is an arithmetic number, because the mean of its divisors is an integer number (220060501082766).

Almost surely, 2^{440121002165531} is an apocalyptic number.

440121002165531 is a deficient number, since it is larger than the sum of its proper divisors (1).

440121002165531 is an equidigital number, since it uses as much as digits as its factorization.

440121002165531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 440121002165531 its reverse (135561200121044), we get a palindrome (575682202286575).

The spelling of 440121002165531 in words is "four hundred forty trillion, one hundred twenty-one billion, two million, one hundred sixty-five thousand, five hundred thirty-one".