91632451285 has 4 divisors (see below), whose sum is σ = 109958941548. Its totient is φ = 73305961024.

The previous prime is 91632451249. The next prime is 91632451289. The reversal of 91632451285 is 58215423619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58215423619 = 929 ⋅62664611.

It can be written as a sum of positive squares in 2 ways, for example, as 44987682609 + 46644768676 = 212103^2 + 215974^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91632451285 is a prime.

It is a super-2 number, since 2×91632451285² (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 (91632451289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9163245124 + ... + 9163245133.

It is an arithmetic number, because the mean of its divisors is an integer number (27489735387).

Almost surely, 2^91632451285 is an apocalyptic number.

It is an amenable number.

91632451285 is a deficient number, since it is larger than the sum of its proper divisors (18326490263).

91632451285 is a wasteful number, since it uses less digits than its factorization.

91632451285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18326490262.

The product of its digits is 518400, while the sum is 46.

The spelling of 91632451285 in words is "ninety-one billion, six hundred thirty-two million, four hundred fifty-one thousand, two hundred eighty-five".