125221311 has 12 divisors (see below), whose sum is σ = 180972792. Its totient is φ = 83435856.

The previous prime is 125221297. The next prime is 125221331. The reversal of 125221311 is 113122521.

125221311 is a `hidden beast` number, since 12 + 522 + 131 + 1 = 666.

It is not a de Polignac number, because 125221311 - 2⁶ = 125221247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125221331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28045 + ... + 32201.

It is an arithmetic number, because the mean of its divisors is an integer number (15081066).

Almost surely, 2^125221311 is an apocalyptic number.

125221311 is a deficient number, since it is larger than the sum of its proper divisors (55751481).

125221311 is a wasteful number, since it uses less digits than its factorization.

125221311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7510 (or 7507 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 125221311 is about 11190.2328394006. The cubic root of 125221311 is about 500.2949073584.

Adding to 125221311 its reverse (113122521), we get a palindrome (238343832).

The spelling of 125221311 in words is "one hundred twenty-five million, two hundred twenty-one thousand, three hundred eleven".