91438156325 has 6 divisors (see below), whose sum is σ = 113383313874. Its totient is φ = 73150525040.

The previous prime is 91438156307. The next prime is 91438156387. The reversal of 91438156325 is 52365183419.

It can be written as a sum of positive squares in 3 ways, for example, as 13815181444 + 77622974881 = 117538^2 + 278609^2 .

It is not a de Polignac number, because 91438156325 - 2¹⁰ = 91438155301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91438156325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1828763102 + ... + 1828763151.

It is an arithmetic number, because the mean of its divisors is an integer number (18897218979).

Almost surely, 2^91438156325 is an apocalyptic number.

It is an amenable number.

91438156325 is a deficient number, since it is larger than the sum of its proper divisors (21945157549).

91438156325 is a wasteful number, since it uses less digits than its factorization.

91438156325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3657526263 (or 3657526258 counting only the distinct ones).

The product of its digits is 777600, while the sum is 47.

The spelling of 91438156325 in words is "ninety-one billion, four hundred thirty-eight million, one hundred fifty-six thousand, three hundred twenty-five".