125999563 has 4 divisors (see below), whose sum is σ = 133411320. Its totient is φ = 118587808.

The previous prime is 125999521. The next prime is 125999567. The reversal of 125999563 is 365999521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125999563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125999567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3705853 + ... + 3705886.

It is an arithmetic number, because the mean of its divisors is an integer number (33352830).

Almost surely, 2^125999563 is an apocalyptic number.

125999563 is a deficient number, since it is larger than the sum of its proper divisors (7411757).

125999563 is an equidigital number, since it uses as much as digits as its factorization.

125999563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7411756.

The product of its digits is 656100, while the sum is 49.

The square root of 125999563 is about 11224.9526947778. The cubic root of 125999563 is about 501.3292139161.

The spelling of 125999563 in words is "one hundred twenty-five million, nine hundred ninety-nine thousand, five hundred sixty-three".