125641729 has 4 divisors (see below), whose sum is σ = 129694720. Its totient is φ = 121588740.

The previous prime is 125641727. The next prime is 125641777. The reversal of 125641729 is 927146521.

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 125641729 - 2¹ = 125641727 is a prime.

It is a super-2 number, since 2×125641729² = 31571688132218882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125641727) 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, 2026449 + ... + 2026510.

It is an arithmetic number, because the mean of its divisors is an integer number (32423680).

Almost surely, 2^125641729 is an apocalyptic number.

It is an amenable number.

125641729 is a deficient number, since it is larger than the sum of its proper divisors (4052991).

125641729 is an equidigital number, since it uses as much as digits as its factorization.

125641729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052990.

The product of its digits is 30240, while the sum is 37.

The square root of 125641729 is about 11209.0021411364. The cubic root of 125641729 is about 500.8541785936.

The spelling of 125641729 in words is "one hundred twenty-five million, six hundred forty-one thousand, seven hundred twenty-nine".