125561565 has 12 divisors (see below), whose sum is σ = 217640124. Its totient is φ = 66966144.

The previous prime is 125561549. The next prime is 125561567. The reversal of 125561565 is 565165521.

It can be written as a sum of positive squares in 2 ways, for example, as 73462041 + 52099524 = 8571^2 + 7218^2 .

It is not a de Polignac number, because 125561565 - 2⁴ = 125561549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125561567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1395084 + ... + 1395173.

It is an arithmetic number, because the mean of its divisors is an integer number (18136677).

Almost surely, 2^125561565 is an apocalyptic number.

125561565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

125561565 is a deficient number, since it is larger than the sum of its proper divisors (92078559).

125561565 is a wasteful number, since it uses less digits than its factorization.

125561565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790268 (or 2790265 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 125561565 is about 11205.4256947249. The cubic root of 125561565 is about 500.7476348604.

The spelling of 125561565 in words is "one hundred twenty-five million, five hundred sixty-one thousand, five hundred sixty-five".