125920643 has 4 divisors (see below), whose sum is σ = 125945448. Its totient is φ = 125895840.

The previous prime is 125920637. The next prime is 125920681. The reversal of 125920643 is 346029521.

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 125920643 - 2⁶ = 125920579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125920603) 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, 1721 + ... + 15962.

It is an arithmetic number, because the mean of its divisors is an integer number (31486362).

Almost surely, 2^125920643 is an apocalyptic number.

125920643 is a deficient number, since it is larger than the sum of its proper divisors (24805).

125920643 is an equidigital number, since it uses as much as digits as its factorization.

125920643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24804.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 125920643 is about 11221.4367618412. The cubic root of 125920643 is about 501.2245226404.

The spelling of 125920643 in words is "one hundred twenty-five million, nine hundred twenty thousand, six hundred forty-three".