1020191 has 8 divisors (see below), whose sum is σ = 1067520. Its totient is φ = 973728.

The previous prime is 1020163. The next prime is 1020223. The reversal of 1020191 is 1910201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3545 + ... + 3821.

It is an arithmetic number, because the mean of its divisors is an integer number (133440).

2^1020191 is an apocalyptic number.

1020191 is a deficient number, since it is larger than the sum of its proper divisors (47329).

1020191 is a wasteful number, since it uses less digits than its factorization.

1020191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1020191 is about 1010.0450485003. The cubic root of 1020191 is about 100.6685537318.

Adding to 1020191 its reverse (1910201), we get a palindrome (2930392).

The spelling of 1020191 in words is "one million, twenty thousand, one hundred ninety-one".