125422121509 has 2 divisors, whose sum is σ = 125422121510. Its totient is φ = 125422121508.

The previous prime is 125422121441. The next prime is 125422121543. The reversal of 125422121509 is 905121224521.

It is an a-pointer prime, because the next prime (125422121543) can be obtained adding 125422121509 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80076548484 + 45345573025 = 282978^2 + 212945^2 .

It is a cyclic number.

It is not a de Polignac number, because 125422121509 - 2¹⁵ = 125422088741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125422121549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62711060754 + 62711060755.

It is an arithmetic number, because the mean of its divisors is an integer number (62711060755).

Almost surely, 2^125422121509 is an apocalyptic number.

It is an amenable number.

125422121509 is a deficient number, since it is larger than the sum of its proper divisors (1).

125422121509 is an equidigital number, since it uses as much as digits as its factorization.

125422121509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 125422121509 in words is "one hundred twenty-five billion, four hundred twenty-two million, one hundred twenty-one thousand, five hundred nine".