1538501249 has 2 divisors, whose sum is σ = 1538501250. Its totient is φ = 1538501248.

The previous prime is 1538501233. The next prime is 1538501291. The reversal of 1538501249 is 9421058351.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1515700624 + 22800625 = 38932^2 + 4775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538501249 - 2⁴ = 1538501233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1538501219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769250624 + 769250625.

It is an arithmetic number, because the mean of its divisors is an integer number (769250625).

Almost surely, 2^1538501249 is an apocalyptic number.

It is an amenable number.

1538501249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538501249 is an equidigital number, since it uses as much as digits as its factorization.

1538501249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 1538501249 is about 39223.7332363966. The cubic root of 1538501249 is about 1154.4256057136.

The spelling of 1538501249 in words is "one billion, five hundred thirty-eight million, five hundred one thousand, two hundred forty-nine".