91229415554 has 4 divisors (see below), whose sum is σ = 136844123334. Its totient is φ = 45614707776.

The previous prime is 91229415551. The next prime is 91229415569. The reversal of 91229415554 is 45551492219.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 45615134929 + 45614280625 = 213577^2 + 213575^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 91229415499 and 91229415508.

It is not an unprimeable number, because it can be changed into a prime (91229415551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22807353887 + ... + 22807353890.

Almost surely, 2^91229415554 is an apocalyptic number.

91229415554 is a deficient number, since it is larger than the sum of its proper divisors (45614707780).

91229415554 is a wasteful number, since it uses less digits than its factorization.

91229415554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45614707779.

The product of its digits is 648000, while the sum is 47.

The spelling of 91229415554 in words is "ninety-one billion, two hundred twenty-nine million, four hundred fifteen thousand, five hundred fifty-four".