1531091 has 2 divisors, whose sum is σ = 1531092. Its totient is φ = 1531090.

The previous prime is 1531081. The next prime is 1531093. The reversal of 1531091 is 1901351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1531091 - 2⁶ = 1531027 is a prime.

Together with 1531093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1531093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765545 + 765546.

It is an arithmetic number, because the mean of its divisors is an integer number (765546).

2^1531091 is an apocalyptic number.

1531091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531091 is an equidigital number, since it uses as much as digits as its factorization.

1531091 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1531091 is about 1237.3726197068. The cubic root of 1531091 is about 115.2569177246.

The spelling of 1531091 in words is "one million, five hundred thirty-one thousand, ninety-one".