15561454031 has 2 divisors, whose sum is σ = 15561454032. Its totient is φ = 15561454030.

The previous prime is 15561454021. The next prime is 15561454063. The reversal of 15561454031 is 13045416551.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15561454031 is a prime.

It is a super-2 number, since 2×15561454031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15561453982 and 15561454000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15561454021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780727015 + 7780727016.

It is an arithmetic number, because the mean of its divisors is an integer number (7780727016).

Almost surely, 2^15561454031 is an apocalyptic number.

15561454031 is a deficient number, since it is larger than the sum of its proper divisors (1).

15561454031 is an equidigital number, since it uses as much as digits as its factorization.

15561454031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 15561454031 in words is "fifteen billion, five hundred sixty-one million, four hundred fifty-four thousand, thirty-one".