125517505 has 16 divisors (see below), whose sum is σ = 155172240. Its totient is φ = 97396992.

The previous prime is 125517499. The next prime is 125517521. The reversal of 125517505 is 505715521.

It can be written as a sum of positive squares in 8 ways, for example, as 703921 + 124813584 = 839^2 + 11172^2 .

It is a cyclic number.

It is not a de Polignac number, because 125517505 - 2⁷ = 125517377 is a prime.

It is a super-2 number, since 2×125517505² = 31509288122850050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72591 + ... + 74299.

It is an arithmetic number, because the mean of its divisors is an integer number (9698265).

Almost surely, 2^125517505 is an apocalyptic number.

It is an amenable number.

125517505 is a deficient number, since it is larger than the sum of its proper divisors (29654735).

125517505 is a wasteful number, since it uses less digits than its factorization.

125517505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148.

The product of its (nonzero) digits is 8750, while the sum is 31.

The square root of 125517505 is about 11203.4595103477. The cubic root of 125517505 is about 500.6890566324.

The spelling of 125517505 in words is "one hundred twenty-five million, five hundred seventeen thousand, five hundred five".