1391129 has 2 divisors, whose sum is σ = 1391130. Its totient is φ = 1391128.

The previous prime is 1391119. The next prime is 1391183. The reversal of 1391129 is 9211931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1054729 + 336400 = 1027^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391129 - 2⁴ = 1391113 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1391098 and 1391107.

It is not a weakly prime, because it can be changed into another prime (1391119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695564 + 695565.

It is an arithmetic number, because the mean of its divisors is an integer number (695565).

2^1391129 is an apocalyptic number.

It is an amenable number.

1391129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391129 is an equidigital number, since it uses as much as digits as its factorization.

1391129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 26.

The square root of 1391129 is about 1179.4613177209. The cubic root of 1391129 is about 111.6321102944.

The spelling of 1391129 in words is "one million, three hundred ninety-one thousand, one hundred twenty-nine".