1231487 has 2 divisors, whose sum is σ = 1231488. Its totient is φ = 1231486.

The previous prime is 1231481. The next prime is 1231511. The reversal of 1231487 is 7841321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231487 - 2⁶ = 1231423 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231481) 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, 615743 + 615744.

It is an arithmetic number, because the mean of its divisors is an integer number (615744).

2^1231487 is an apocalyptic number.

1231487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231487 is an equidigital number, since it uses as much as digits as its factorization.

1231487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 26.

The square root of 1231487 is about 1109.7238395204. The cubic root of 1231487 is about 107.1872866318.

The spelling of 1231487 in words is "one million, two hundred thirty-one thousand, four hundred eighty-seven".