1249446389 has 2 divisors, whose sum is σ = 1249446390. Its totient is φ = 1249446388.

The previous prime is 1249446343. The next prime is 1249446391. The reversal of 1249446389 is 9836449421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 856732900 + 392713489 = 29270^2 + 19817^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249446389 - 2²⁴ = 1232669173 is a prime.

It is a super-2 number, since 2×1249446389² = 3122232557970278642, which contains 22 as substring.

Together with 1249446391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249446589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624723194 + 624723195.

It is an arithmetic number, because the mean of its divisors is an integer number (624723195).

Almost surely, 2^1249446389 is an apocalyptic number.

It is an amenable number.

1249446389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249446389 is an equidigital number, since it uses as much as digits as its factorization.

1249446389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 50.

The square root of 1249446389 is about 35347.5089504197. The cubic root of 1249446389 is about 1077.0582923670.

The spelling of 1249446389 in words is "one billion, two hundred forty-nine million, four hundred forty-six thousand, three hundred eighty-nine".