1391061 has 12 divisors (see below), whose sum is σ = 2157792. Its totient is φ = 794808.

The previous prime is 1391057. The next prime is 1391081. The reversal of 1391061 is 1601931.

It is a happy number.

It is not a de Polignac number, because 1391061 - 2² = 1391057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4585 + ... + 4878.

It is an arithmetic number, because the mean of its divisors is an integer number (179816).

2^1391061 is an apocalyptic number.

It is an amenable number.

1391061 is a deficient number, since it is larger than the sum of its proper divisors (766731).

1391061 is an equidigital number, since it uses as much as digits as its factorization.

1391061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9480 (or 9473 counting only the distinct ones).

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

The square root of 1391061 is about 1179.4324906496. The cubic root of 1391061 is about 111.6302913624.

Adding to 1391061 its reverse (1601931), we get a palindrome (2992992).

The spelling of 1391061 in words is "one million, three hundred ninety-one thousand, sixty-one".