16506131431 has 2 divisors, whose sum is σ = 16506131432. Its totient is φ = 16506131430.

The previous prime is 16506131417. The next prime is 16506131483. The reversal of 16506131431 is 13413160561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16506131431 - 2¹¹ = 16506129383 is a prime.

It is a super-2 number, since 2×16506131431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16506131393 and 16506131402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16506134431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8253065715 + 8253065716.

It is an arithmetic number, because the mean of its divisors is an integer number (8253065716).

Almost surely, 2^16506131431 is an apocalyptic number.

16506131431 is a deficient number, since it is larger than the sum of its proper divisors (1).

16506131431 is an equidigital number, since it uses as much as digits as its factorization.

16506131431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

Adding to 16506131431 its reverse (13413160561), we get a palindrome (29919291992).

The spelling of 16506131431 in words is "sixteen billion, five hundred six million, one hundred thirty-one thousand, four hundred thirty-one".