81498162431 has 4 divisors (see below), whose sum is σ = 93140757072. Its totient is φ = 69855567792.

The previous prime is 81498162407. The next prime is 81498162437. The reversal of 81498162431 is 13426189418.

It is a happy number.

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-81498162431 is a prime.

It is a super-2 number, since 2×81498162431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81498162437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5821297310 + ... + 5821297323.

It is an arithmetic number, because the mean of its divisors is an integer number (23285189268).

Almost surely, 2^81498162431 is an apocalyptic number.

81498162431 is a deficient number, since it is larger than the sum of its proper divisors (11642594641).

81498162431 is a wasteful number, since it uses less digits than its factorization.

81498162431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11642594640.

The product of its digits is 331776, while the sum is 47.

The spelling of 81498162431 in words is "eighty-one billion, four hundred ninety-eight million, one hundred sixty-two thousand, four hundred thirty-one".