1545889249 has 2 divisors, whose sum is σ = 1545889250. Its totient is φ = 1545889248.

The previous prime is 1545889217. The next prime is 1545889333. The reversal of 1545889249 is 9429885451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1526308624 + 19580625 = 39068^2 + 4425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1545889249 - 2⁵ = 1545889217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1545889249.

It is not a weakly prime, because it can be changed into another prime (1545889049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772944624 + 772944625.

It is an arithmetic number, because the mean of its divisors is an integer number (772944625).

Almost surely, 2^1545889249 is an apocalyptic number.

It is an amenable number.

1545889249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545889249 is an equidigital number, since it uses as much as digits as its factorization.

1545889249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4147200, while the sum is 55.

The square root of 1545889249 is about 39317.7981199355. The cubic root of 1545889249 is about 1156.2705355437.

The spelling of 1545889249 in words is "one billion, five hundred forty-five million, eight hundred eighty-nine thousand, two hundred forty-nine".