91431536369281 has 8 divisors (see below), whose sum is σ = 96441348217280. Its totient is φ = 86441487093648.

The previous prime is 91431536369269. The next prime is 91431536369321. The reversal of 91431536369281 is 18296363513419.

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

It is a cyclic number.

It is not a de Polignac number, because 91431536369281 - 2⁴³ = 82635443347073 is a prime.

It is a super-2 number, since 2×91431536369281² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91431536369081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4940633586 + ... + 4940652091.

It is an arithmetic number, because the mean of its divisors is an integer number (12055168527160).

Almost surely, 2^{91431536369281} is an apocalyptic number.

It is an amenable number.

91431536369281 is a deficient number, since it is larger than the sum of its proper divisors (5009811847999).

91431536369281 is a wasteful number, since it uses less digits than its factorization.

91431536369281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9881286183.

The product of its digits is 25194240, while the sum is 61.

The spelling of 91431536369281 in words is "ninety-one trillion, four hundred thirty-one billion, five hundred thirty-six million, three hundred sixty-nine thousand, two hundred eighty-one".