125231621 has 2 divisors, whose sum is σ = 125231622. Its totient is φ = 125231620.

The previous prime is 125231611. The next prime is 125231663. The reversal of 125231621 is 126132521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65772100 + 59459521 = 8110^2 + 7711^2 .

It is a cyclic number.

It is not a de Polignac number, because 125231621 - 2¹⁰ = 125230597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125231611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62615810 + 62615811.

It is an arithmetic number, because the mean of its divisors is an integer number (62615811).

Almost surely, 2^125231621 is an apocalyptic number.

It is an amenable number.

125231621 is a deficient number, since it is larger than the sum of its proper divisors (1).

125231621 is an equidigital number, since it uses as much as digits as its factorization.

125231621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 125231621 is about 11190.6934995111. The cubic root of 125231621 is about 500.3086374467.

The spelling of 125231621 in words is "one hundred twenty-five million, two hundred thirty-one thousand, six hundred twenty-one".