10091918 has 4 divisors (see below), whose sum is σ = 15137880. Its totient is φ = 5045958.

The previous prime is 10091911. The next prime is 10091923. The reversal of 10091918 is 81919001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81919001 = 9011 ⋅9091.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10091911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2522978 + ... + 2522981.

It is an arithmetic number, because the mean of its divisors is an integer number (3784470).

Almost surely, 2^10091918 is an apocalyptic number.

10091918 is a deficient number, since it is larger than the sum of its proper divisors (5045962).

10091918 is an equidigital number, since it uses as much as digits as its factorization.

10091918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5045961.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 10091918 is about 3176.7779273975. Note that the first 3 decimals coincide. The cubic root of 10091918 is about 216.1015611786.

The spelling of 10091918 in words is "ten million, ninety-one thousand, nine hundred eighteen".