125212643 has 4 divisors (see below), whose sum is σ = 125615568. Its totient is φ = 124809720.

The previous prime is 125212639. The next prime is 125212649. The reversal of 125212643 is 346212521.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 125212643 - 2² = 125212639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125212649) 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, 200996 + ... + 201617.

It is an arithmetic number, because the mean of its divisors is an integer number (31403892).

Almost surely, 2^125212643 is an apocalyptic number.

125212643 is a deficient number, since it is larger than the sum of its proper divisors (402925).

125212643 is an equidigital number, since it uses as much as digits as its factorization.

125212643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402924.

The product of its digits is 2880, while the sum is 26.

The square root of 125212643 is about 11189.8455306586. The cubic root of 125212643 is about 500.2833633801.

The spelling of 125212643 in words is "one hundred twenty-five million, two hundred twelve thousand, six hundred forty-three".