125543865 has 16 divisors (see below), whose sum is σ = 201017088. Its totient is φ = 66907776.

The previous prime is 125543837. The next prime is 125543881. The reversal of 125543865 is 568345521.

It is not a de Polignac number, because 125543865 - 2⁶ = 125543801 is a prime.

It is a super-2 number, since 2×125543865² = 31522524078276450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28917 + ... + 32973.

It is an arithmetic number, because the mean of its divisors is an integer number (12563568).

Almost surely, 2^125543865 is an apocalyptic number.

125543865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

125543865 is a deficient number, since it is larger than the sum of its proper divisors (75473223).

125543865 is a wasteful number, since it uses less digits than its factorization.

125543865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6128.

The product of its digits is 144000, while the sum is 39.

The square root of 125543865 is about 11204.6358709241. The cubic root of 125543865 is about 500.7241041734.

The spelling of 125543865 in words is "one hundred twenty-five million, five hundred forty-three thousand, eight hundred sixty-five".