1061391 has 4 divisors (see below), whose sum is σ = 1415192. Its totient is φ = 707592.

The previous prime is 1061377. The next prime is 1061393. The reversal of 1061391 is 1931601.

It is a happy number.

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

It is not a de Polignac number, because 1061391 - 2¹¹ = 1059343 is a prime.

It is a super-2 number, since 2×1061391² = 2253101709762, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

1061391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061393) 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, 176896 + ... + 176901.

It is an arithmetic number, because the mean of its divisors is an integer number (353798).

2^1061391 is an apocalyptic number.

1061391 is a deficient number, since it is larger than the sum of its proper divisors (353801).

1061391 is an equidigital number, since it uses as much as digits as its factorization.

1061391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353800.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 1061391 is about 1030.2383219430. The cubic root of 1061391 is about 102.0058627926.

Adding to 1061391 its reverse (1931601), we get a palindrome (2992992).

The spelling of 1061391 in words is "one million, sixty-one thousand, three hundred ninety-one".