105191491 has 4 divisors (see below), whose sum is σ = 105212952. Its totient is φ = 105170032.

The previous prime is 105191473. The next prime is 105191501. The reversal of 105191491 is 194191501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194191501 = 7 ⋅27741643.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105191491 is a prime.

It is a super-2 number, since 2×105191491² = 22130499557606162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105191791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636 + ... + 14518.

It is an arithmetic number, because the mean of its divisors is an integer number (26303238).

Almost surely, 2^105191491 is an apocalyptic number.

105191491 is a deficient number, since it is larger than the sum of its proper divisors (21461).

105191491 is an equidigital number, since it uses as much as digits as its factorization.

105191491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21460.

The product of its (nonzero) digits is 1620, while the sum is 31.

The square root of 105191491 is about 10256.2903137538. The cubic root of 105191491 is about 472.0560162260.

The spelling of 105191491 in words is "one hundred five million, one hundred ninety-one thousand, four hundred ninety-one".