91148999405 has 16 divisors (see below), whose sum is σ = 115068297600. Its totient is φ = 69211437120.

The previous prime is 91148999363. The next prime is 91148999413. The reversal of 91148999405 is 50499984119.

It is not a de Polignac number, because 91148999405 - 2¹⁸ = 91148737261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5318681 + ... + 5335790.

It is an arithmetic number, because the mean of its divisors is an integer number (7191768600).

Almost surely, 2^91148999405 is an apocalyptic number.

It is an amenable number.

91148999405 is a deficient number, since it is larger than the sum of its proper divisors (23919298195).

91148999405 is a wasteful number, since it uses less digits than its factorization.

91148999405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10654564.

The product of its (nonzero) digits is 4199040, while the sum is 59.

The spelling of 91148999405 in words is "ninety-one billion, one hundred forty-eight million, nine hundred ninety-nine thousand, four hundred five".