125656381 has 4 divisors (see below), whose sum is σ = 125860000. Its totient is φ = 125452764.

The previous prime is 125656357. The next prime is 125656387. The reversal of 125656381 is 183656521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125656381 - 2²¹ = 123559229 is a prime.

It is a super-2 number, since 2×125656381² = 31579052172034322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125656381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125656387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100881 + ... + 102118.

It is an arithmetic number, because the mean of its divisors is an integer number (31465000).

Almost surely, 2^125656381 is an apocalyptic number.

It is an amenable number.

125656381 is a deficient number, since it is larger than the sum of its proper divisors (203619).

125656381 is an equidigital number, since it uses as much as digits as its factorization.

125656381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203618.

The product of its digits is 43200, while the sum is 37.

The square root of 125656381 is about 11209.6557039010. The cubic root of 125656381 is about 500.8736472585.

The spelling of 125656381 in words is "one hundred twenty-five million, six hundred fifty-six thousand, three hundred eighty-one".