1291547 has 2 divisors, whose sum is σ = 1291548. Its totient is φ = 1291546.

The previous prime is 1291523. The next prime is 1291567. The reversal of 1291547 is 7451921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291547 - 2⁶ = 1291483 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645773 + 645774.

It is an arithmetic number, because the mean of its divisors is an integer number (645774).

2^1291547 is an apocalyptic number.

1291547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291547 is an equidigital number, since it uses as much as digits as its factorization.

1291547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 1291547 is about 1136.4624938818. The cubic root of 1291547 is about 108.9022213224.

The spelling of 1291547 in words is "one million, two hundred ninety-one thousand, five hundred forty-seven".