125621901 has 16 divisors (see below), whose sum is σ = 195902400. Its totient is φ = 79339824.

The previous prime is 125621869. The next prime is 125621941. The reversal of 125621901 is 109126521.

125621901 is a `hidden beast` number, since 12 + 562 + 1 + 90 + 1 = 666.

It is not a de Polignac number, because 125621901 - 2⁵ = 125621869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125621941) 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 15 ways as a sum of consecutive naturals, for example, 121926 + ... + 122951.

It is an arithmetic number, because the mean of its divisors is an integer number (12243900).

Almost surely, 2^125621901 is an apocalyptic number.

It is an amenable number.

125621901 is a deficient number, since it is larger than the sum of its proper divisors (70280499).

125621901 is a wasteful number, since it uses less digits than its factorization.

125621901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244905 (or 244899 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 125621901 is about 11208.1176385689. The cubic root of 125621901 is about 500.8278299720.

The spelling of 125621901 in words is "one hundred twenty-five million, six hundred twenty-one thousand, nine hundred one".