125621969 has 4 divisors (see below), whose sum is σ = 137042160. Its totient is φ = 114201780.

The previous prime is 125621941. The next prime is 125621971. The reversal of 125621969 is 969126521.

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 not a de Polignac number, because 125621969 - 2²⁴ = 108844753 is a prime.

It is a super-2 number, since 2×125621969² = 31561758190873922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (125621989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5710079 + ... + 5710100.

It is an arithmetic number, because the mean of its divisors is an integer number (34260540).

Almost surely, 2^125621969 is an apocalyptic number.

It is an amenable number.

125621969 is a deficient number, since it is larger than the sum of its proper divisors (11420191).

125621969 is a wasteful number, since it uses less digits than its factorization.

125621969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11420190.

The product of its digits is 58320, while the sum is 41.

The square root of 125621969 is about 11208.1206720841. The cubic root of 125621969 is about 500.8279203392.

The spelling of 125621969 in words is "one hundred twenty-five million, six hundred twenty-one thousand, nine hundred sixty-nine".