125840561 has 8 divisors (see below), whose sum is σ = 156892224. Its totient is φ = 98057520.

The previous prime is 125840557. The next prime is 125840581. The reversal of 125840561 is 165048521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125840561 - 2² = 125840557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125840551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 817070 + ... + 817223.

It is an arithmetic number, because the mean of its divisors is an integer number (19611528).

Almost surely, 2^125840561 is an apocalyptic number.

125840561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125840561 is a deficient number, since it is larger than the sum of its proper divisors (31051663).

125840561 is a wasteful number, since it uses less digits than its factorization.

125840561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634311.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 125840561 is about 11217.8679346835. The cubic root of 125840561 is about 501.1182451909.

The spelling of 125840561 in words is "one hundred twenty-five million, eight hundred forty thousand, five hundred sixty-one".