125666389 has 2 divisors, whose sum is σ = 125666390. Its totient is φ = 125666388.

The previous prime is 125666383. The next prime is 125666407. The reversal of 125666389 is 983666521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73393489 + 52272900 = 8567^2 + 7230^2 .

It is a cyclic number.

It is not a de Polignac number, because 125666389 - 2³ = 125666381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125666381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62833194 + 62833195.

It is an arithmetic number, because the mean of its divisors is an integer number (62833195).

Almost surely, 2^125666389 is an apocalyptic number.

It is an amenable number.

125666389 is a deficient number, since it is larger than the sum of its proper divisors (1).

125666389 is an equidigital number, since it uses as much as digits as its factorization.

125666389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 46.

The square root of 125666389 is about 11210.1020958776. The cubic root of 125666389 is about 500.8869443956.

The spelling of 125666389 in words is "one hundred twenty-five million, six hundred sixty-six thousand, three hundred eighty-nine".