1544404142231 has 4 divisors (see below), whose sum is σ = 1567454950392. Its totient is φ = 1521353334072.

The previous prime is 1544404142189. The next prime is 1544404142251. The reversal of 1544404142231 is 1322414044451.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1544404142231 is a prime.

It is a super-2 number, since 2×1544404142231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1544404142191 and 1544404142200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1544404142251) 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, 11525403980 + ... + 11525404113.

It is an arithmetic number, because the mean of its divisors is an integer number (391863737598).

Almost surely, 2^{1544404142231} is an apocalyptic number.

1544404142231 is a deficient number, since it is larger than the sum of its proper divisors (23050808161).

1544404142231 is an equidigital number, since it uses as much as digits as its factorization.

1544404142231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23050808160.

The product of its (nonzero) digits is 61440, while the sum is 35.

Adding to 1544404142231 its reverse (1322414044451), we get a palindrome (2866818186682).

The spelling of 1544404142231 in words is "one trillion, five hundred forty-four billion, four hundred four million, one hundred forty-two thousand, two hundred thirty-one".