901191 has 4 divisors (see below), whose sum is σ = 1201592. Its totient is φ = 600792.

The previous prime is 901183. The next prime is 901193. The reversal of 901191 is 191109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191109 = 3 ⋅63703.

It is not a de Polignac number, because 901191 - 2³ = 901183 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901193) 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, 150196 + ... + 150201.

It is an arithmetic number, because the mean of its divisors is an integer number (300398).

2⁹⁰¹¹⁹¹ is an apocalyptic number.

901191 is a deficient number, since it is larger than the sum of its proper divisors (300401).

901191 is a wasteful number, since it uses less digits than its factorization.

901191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300400.

The product of its (nonzero) digits is 81, while the sum is 21.

The square root of 901191 is about 949.3108026353. The cubic root of 901191 is about 96.5915084975.

The spelling of 901191 in words is "nine hundred one thousand, one hundred ninety-one".