125369969 has 2 divisors, whose sum is σ = 125369970. Its totient is φ = 125369968.

The previous prime is 125369953. The next prime is 125369971. The reversal of 125369969 is 969963521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88585744 + 36784225 = 9412^2 + 6065^2 .

It is a cyclic number.

It is not a de Polignac number, because 125369969 - 2⁴ = 125369953 is a prime.

It is a super-2 number, since 2×125369969² = 31435258254121922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 125369971, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (125369669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62684984 + 62684985.

It is an arithmetic number, because the mean of its divisors is an integer number (62684985).

Almost surely, 2^125369969 is an apocalyptic number.

It is an amenable number.

125369969 is a deficient number, since it is larger than the sum of its proper divisors (1).

125369969 is an equidigital number, since it uses as much as digits as its factorization.

125369969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 787320, while the sum is 50.

The square root of 125369969 is about 11196.8731795980. The cubic root of 125369969 is about 500.4928061247.

It can be divided in two parts, 12 and 5369969, that multiplied together give a triangular number (64439628 = T₁₁₃₅₂).

The spelling of 125369969 in words is "one hundred twenty-five million, three hundred sixty-nine thousand, nine hundred sixty-nine".