249009389 has 2 divisors, whose sum is σ = 249009390. Its totient is φ = 249009388.

The previous prime is 249009367. The next prime is 249009407. The reversal of 249009389 is 983900942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220760164 + 28249225 = 14858^2 + 5315^2 .

It is a cyclic number.

It is not a de Polignac number, because 249009389 - 2¹² = 249005293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249009589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124504694 + 124504695.

It is an arithmetic number, because the mean of its divisors is an integer number (124504695).

Almost surely, 2^249009389 is an apocalyptic number.

It is an amenable number.

249009389 is a deficient number, since it is larger than the sum of its proper divisors (1).

249009389 is an equidigital number, since it uses as much as digits as its factorization.

249009389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 249009389 is about 15780.0313371045. The cubic root of 249009389 is about 629.1273624225.

The spelling of 249009389 in words is "two hundred forty-nine million, nine thousand, three hundred eighty-nine".