1020091 has 8 divisors (see below), whose sum is σ = 1095120. Its totient is φ = 947232.

The previous prime is 1020079. The next prime is 1020101. The reversal of 1020091 is 1900201.

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

It is a cyclic number.

It is not a de Polignac number, because 1020091 - 2⁵ = 1020059 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 (1020001) 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, 501 + ... + 1513.

It is an arithmetic number, because the mean of its divisors is an integer number (136890).

2^1020091 is an apocalyptic number.

1020091 is a deficient number, since it is larger than the sum of its proper divisors (75029).

1020091 is a wasteful number, since it uses less digits than its factorization.

1020091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1020091 is about 1009.9955445446. The cubic root of 1020091 is about 100.6652644182.

Adding to 1020091 its reverse (1900201), we get a palindrome (2920292).

The spelling of 1020091 in words is "one million, twenty thousand, ninety-one".