1391087 has 2 divisors, whose sum is σ = 1391088. Its totient is φ = 1391086.

The previous prime is 1391083. The next prime is 1391113. The reversal of 1391087 is 7801931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1391087 - 2² = 1391083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695543 + 695544.

It is an arithmetic number, because the mean of its divisors is an integer number (695544).

2^1391087 is an apocalyptic number.

1391087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391087 is an equidigital number, since it uses as much as digits as its factorization.

1391087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1391087 is about 1179.4435128483. The cubic root of 1391087 is about 111.6309868434.

The spelling of 1391087 in words is "one million, three hundred ninety-one thousand, eighty-seven".