125844989 has 2 divisors, whose sum is σ = 125844990. Its totient is φ = 125844988.

The previous prime is 125844973. The next prime is 125845009. The reversal of 125844989 is 989448521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123765625 + 2079364 = 11125^2 + 1442^2 .

It is a cyclic number.

It is not a de Polignac number, because 125844989 - 2⁴ = 125844973 is a prime.

It is a super-2 number, since 2×125844989² = 31673922512820242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125844959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62922494 + 62922495.

It is an arithmetic number, because the mean of its divisors is an integer number (62922495).

Almost surely, 2^125844989 is an apocalyptic number.

It is an amenable number.

125844989 is a deficient number, since it is larger than the sum of its proper divisors (1).

125844989 is an equidigital number, since it uses as much as digits as its factorization.

125844989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 50.

The square root of 125844989 is about 11218.0652966543. The cubic root of 125844989 is about 501.1241228019.

The spelling of 125844989 in words is "one hundred twenty-five million, eight hundred forty-four thousand, nine hundred eighty-nine".