1538491 has 2 divisors, whose sum is σ = 1538492. Its totient is φ = 1538490.

The previous prime is 1538473. The next prime is 1538501. The reversal of 1538491 is 1948351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1538491 - 2¹⁵ = 1505723 is a prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (1538441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769245 + 769246.

It is an arithmetic number, because the mean of its divisors is an integer number (769246).

2^1538491 is an apocalyptic number.

1538491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538491 is an equidigital number, since it uses as much as digits as its factorization.

1538491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 1538491 is about 1240.3592221611. The cubic root of 1538491 is about 115.4423042237.

The spelling of 1538491 in words is "one million, five hundred thirty-eight thousand, four hundred ninety-one".