1391051 has 2 divisors, whose sum is σ = 1391052. Its totient is φ = 1391050.

The previous prime is 1391041. The next prime is 1391057. The reversal of 1391051 is 1501931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1391051 - 2¹⁰ = 1390027 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1391057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695525 + 695526.

It is an arithmetic number, because the mean of its divisors is an integer number (695526).

2^1391051 is an apocalyptic number.

1391051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391051 is an equidigital number, since it uses as much as digits as its factorization.

1391051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135, while the sum is 20.

The square root of 1391051 is about 1179.4282513150. The cubic root of 1391051 is about 111.6300238674.

Adding to 1391051 its reverse (1501931), we get a palindrome (2892982).

The spelling of 1391051 in words is "one million, three hundred ninety-one thousand, fifty-one".