91158551842 has 16 divisors (see below), whose sum is σ = 144097984800. Its totient is φ = 43131337920.

The previous prime is 91158551821. The next prime is 91158551843. The reversal of 91158551842 is 24815585119.

It is not an unprimeable number, because it can be changed into a prime (91158551843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1327992 + ... + 1394947.

It is an arithmetic number, because the mean of its divisors is an integer number (9006124050).

Almost surely, 2^91158551842 is an apocalyptic number.

91158551842 is a deficient number, since it is larger than the sum of its proper divisors (52939432958).

91158551842 is a wasteful number, since it uses less digits than its factorization.

91158551842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2723841.

The product of its digits is 576000, while the sum is 49.

The spelling of 91158551842 in words is "ninety-one billion, one hundred fifty-eight million, five hundred fifty-one thousand, eight hundred forty-two".