91723871432 has 12 divisors (see below), whose sum is σ = 171983865105. Its totient is φ = 45861507408.

The previous prime is 91723871429. The next prime is 91723871441. The reversal of 91723871432 is 23417832719.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 86981345476 + 4742525956 = 294926^2 + 68866^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=214154.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 803078 + ... + 910154.

Almost surely, 2^91723871432 is an apocalyptic number.

It is an amenable number.

91723871432 is a deficient number, since it is larger than the sum of its proper divisors (80259993673).

91723871432 is an frugal number, since it uses more digits than its factorization.

91723871432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214160 (or 107079 counting only the distinct ones).

The product of its digits is 508032, while the sum is 47.

The spelling of 91723871432 in words is "ninety-one billion, seven hundred twenty-three million, eight hundred seventy-one thousand, four hundred thirty-two".