125321520145 has 4 divisors (see below), whose sum is σ = 150385824180. Its totient is φ = 100257216112.

The previous prime is 125321520131. The next prime is 125321520157. The reversal of 125321520145 is 541025123521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79212976704 + 46108543441 = 281448^2 + 214729^2 .

It is a cyclic number.

It is not a de Polignac number, because 125321520145 - 2¹⁹ = 125320995857 is a prime.

It is a super-2 number, since 2×125321520145² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12532152010 + ... + 12532152019.

It is an arithmetic number, because the mean of its divisors is an integer number (37596456045).

Almost surely, 2^125321520145 is an apocalyptic number.

It is an amenable number.

125321520145 is a deficient number, since it is larger than the sum of its proper divisors (25064304035).

125321520145 is an equidigital number, since it uses as much as digits as its factorization.

125321520145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25064304034.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 125321520145 its reverse (541025123521), we get a palindrome (666346643666).

The spelling of 125321520145 in words is "one hundred twenty-five billion, three hundred twenty-one million, five hundred twenty thousand, one hundred forty-five".