191901641 has 4 divisors (see below), whose sum is σ = 192615300. Its totient is φ = 191187984.

The previous prime is 191901631. The next prime is 191901667. The reversal of 191901641 is 146109191.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40513225 + 151388416 = 6365^2 + 12304^2 .

It is not a de Polignac number, because 191901641 - 2¹⁰ = 191900617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191901598 and 191901607.

It is not an unprimeable number, because it can be changed into a prime (191901631) 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, 356426 + ... + 356963.

It is an arithmetic number, because the mean of its divisors is an integer number (48153825).

Almost surely, 2^191901641 is an apocalyptic number.

It is an amenable number.

191901641 is a deficient number, since it is larger than the sum of its proper divisors (713659).

191901641 is an equidigital number, since it uses as much as digits as its factorization.

191901641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713658.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 191901641 is about 13852.8567811842. The cubic root of 191901641 is about 576.8012986394.

The spelling of 191901641 in words is "one hundred ninety-one million, nine hundred one thousand, six hundred forty-one".