1438248191 has 2 divisors, whose sum is σ = 1438248192. Its totient is φ = 1438248190.

The previous prime is 1438248173. The next prime is 1438248209. The reversal of 1438248191 is 1918428341.

It is a balanced prime because it is at equal distance from previous prime (1438248173) and next prime (1438248209).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1438248191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1438248101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719124095 + 719124096.

It is an arithmetic number, because the mean of its divisors is an integer number (719124096).

Almost surely, 2^1438248191 is an apocalyptic number.

1438248191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438248191 is an equidigital number, since it uses as much as digits as its factorization.

1438248191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 41.

The square root of 1438248191 is about 37924.2427874308. The cubic root of 1438248191 is about 1128.7851278993.

The spelling of 1438248191 in words is "one billion, four hundred thirty-eight million, two hundred forty-eight thousand, one hundred ninety-one".