1528248991 has 2 divisors, whose sum is σ = 1528248992. Its totient is φ = 1528248990.

The previous prime is 1528248947. The next prime is 1528249001. The reversal of 1528248991 is 1998428251.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1528248991 - 2¹⁵ = 1528216223 is a prime.

It is a super-5 number, since 5×1528248991⁵ (a number of 47 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1528278991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 764124495 + 764124496.

It is an arithmetic number, because the mean of its divisors is an integer number (764124496).

Almost surely, 2^1528248991 is an apocalyptic number.

1528248991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1528248991 is an equidigital number, since it uses as much as digits as its factorization.

1528248991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 49.

The square root of 1528248991 is about 39092.8253136045. The cubic root of 1528248991 is about 1151.8556031137.

The spelling of 1528248991 in words is "one billion, five hundred twenty-eight million, two hundred forty-eight thousand, nine hundred ninety-one".