15541421431 has 8 divisors (see below), whose sum is σ = 16402563200. Its totient is φ = 14684596920.

The previous prime is 15541421377. The next prime is 15541421443. The reversal of 15541421431 is 13412414551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15541421431 is a prime.

It is a super-2 number, since 2×15541421431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15541421393 and 15541421402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15541401431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1071915 + ... + 1086316.

It is an arithmetic number, because the mean of its divisors is an integer number (2050320400).

Almost surely, 2^15541421431 is an apocalyptic number.

15541421431 is a deficient number, since it is larger than the sum of its proper divisors (861141769).

15541421431 is a wasteful number, since it uses less digits than its factorization.

15541421431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158629.

The product of its digits is 9600, while the sum is 31.

Adding to 15541421431 its reverse (13412414551), we get a palindrome (28953835982).

The spelling of 15541421431 in words is "fifteen billion, five hundred forty-one million, four hundred twenty-one thousand, four hundred thirty-one".