91054778 has 4 divisors (see below), whose sum is σ = 136582170. Its totient is φ = 45527388.

The previous prime is 91054757. The next prime is 91054787. The reversal of 91054778 is 87745019.

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., 57957769 + 33097009 = 7613^2 + 5753^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22763693 + ... + 22763696.

Almost surely, 2^91054778 is an apocalyptic number.

91054778 is a deficient number, since it is larger than the sum of its proper divisors (45527392).

91054778 is a wasteful number, since it uses less digits than its factorization.

91054778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45527391.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 91054778 is about 9542.2627295626. The cubic root of 91054778 is about 449.8843785256.

The spelling of 91054778 in words is "ninety-one million, fifty-four thousand, seven hundred seventy-eight".